MedTerm Speak

Master the language of medicine

Ecchymosis

ek-ih-MOH-sis

/ˌɛkɪˈmoʊsɪs/

A discoloration of the skin resulting from bleeding underneath, typically caused by bruising.

Ecchymosis

ek-ih-MOH-sis

/ˌɛkɪˈmoʊsɪs/

A discoloration of the skin resulting from bleeding underneath, typically caused by bruising.

Eccrine

EK-rin

/ˈɛkrɪn/

Relating to the most common type of sweat gland, which produces a clear, odorless substance directly onto the skin surface.

Echocardiogram

ek-oh-KAR-dee-oh-gram

/ˌɛkoʊˈkɑːrdiəˌɡræm/

A test of the action of the heart using ultrasound waves to produce a visual display.

Echolalia

ek-oh-LAY-lee-ah

/ˌɛkoʊˈleɪliə/

Meaningless repetition of another person's spoken words as a symptom of psychiatric disorder.

Eclampsia

eh-KLAMP-see-ah

/ɪˈklæmpsiə/

A condition in which one or more convulsions occur in a pregnant woman suffering from high blood pressure (preeclampsia).

Ectoderm

EK-toh-derm

/ˈɛktəˌdɜːrm/

The outermost layer of cells or tissue of an embryo in early development, which gives rise to the skin and nervous system.

Ectopia

ek-TOH-pee-ah

/ɛkˈtoʊpiə/

A displacement or malposition of an organ or other body part of the body.

Ectopic Pregnancy

ek-TOP-ik PREG-nan-see

/ɛkˈtɒpɪk ˈprɛɡnənsi/

A pregnancy in which the fetus develops outside the uterus, typically in a Fallopian tube.

Ectropion

ek-TROH-pee-on

/ɛkˈtroʊpiɒn/

A condition, typically a consequence of advanced age, in which the eyelid is turned outward away from the eyeball.

Eczema

EK-zeh-mah

/ˈɛksɪmə/

A medical condition in which patches of skin become rough and inflamed, with blisters that cause itching and bleeding.

Edema

eh-DEE-mah

/ɪˈdiːmə/

A condition characterized by an excess of watery fluid collecting in the cavities or tissues of the body.

Effacement

eh-FAYS-ment

/ɪˈfeɪsmənt/

The process by which the cervix prepares for delivery by thinning out and shortening.

Efferent

EF-er-ent

/ˈɛfərənt/

Conducted or conducting outward or away from something (for example, a nerve carrying impulses from the brain to the muscles).

Effusion

eh-FYOO-zhun

/ɪˈfjuːʒən/

An instance of giving off something such as a liquid or gas; in medicine, the escape of fluid into a body cavity.

Effusion

ee-FYOO-zhun

/ɪˈfjuːʒən/

An instance of giving off something such as a liquid, light, or smell; in medicine, the escape of fluid into a body cavity.

Ego

EE-goh

/ˈiːɡoʊ/

In psychoanalysis, the part of the mind that mediates between the conscious and the unconscious and is responsible for reality testing.

Ejaculation

ee-jak-yoo-LAY-shun

/ɪˌdʒækjʊˈleɪʃən/

The action of ejecting semen from the body.

Elastin

ee-LAS-tin

/ɪˈlæstɪn/

A protein forming the main constituent of elastic connective tissue, found especially in the dermis of the skin and the walls of large blood vessels.

Electrocardiogram

ee-lek-troh-KAR-dee-oh-gram

/ɪˌlɛktroʊˈkɑːrdiəˌɡræm/

A record or display of a person's heartbeat produced by electrocardiography (ECG/EKG).

Electroencephalogram

ee-lek-troh-en-SEF-ah-loh-gram

/ɪˌlɛktroʊɛnˈsɛfələˌɡræm/

A test or record of brain activity produced by electroencephalography (EEG).

Electrolysis

ee-lek-TROL-ih-sis

/ɪˌlɛkˈtrɒlɪsɪs/

The destruction of tumors, hair roots, or other abnormal tissue by an electric current.

Electrolyte

ee-LEK-troh-lyt

/ɪˈlɛktrəˌlaɪt/

A liquid or gel that contains ions and can be decomposed by electrolysis, e.g., sodium, potassium, and chloride in the blood.

Electromyography

ee-lek-troh-my-OG-rah-fee

/ɪˌlɛktroʊmaɪˈɒɡrəfi/

The recording of the electrical activity of muscle tissue, or its representation as a visual display or audible signal (EMG).

Elephantiasis

el-eh-fan-TY-ah-sis

/ˌɛlɪfənˈtaɪəsɪs/

A condition in which a limb or other part of the body becomes grossly enlarged due to obstruction of the lymphatic vessels.

Elimination

ee-lim-ih-NAY-shun

/ɪˌlɪmɪˈneɪʃən/

The act of discharging or excreting waste products from the body.

Emaciation

ee-may-see-AY-shun

/ɪˌmeɪsiˈeɪʃən/

The state of being abnormally thin or weak, usually caused by lack of food or a wasting disease.

Embolectomy

em-boh-LEK-toh-mee

/ˌɛmbəˈlɛktəmi/

The surgical removal of an embolus (blood clot) from a blood vessel.

Embolism

EM-boh-lizm

/ˈɛmbəˌlɪzəm/

Obstruction of an artery, typically by a clot of blood or an air bubble.

Embolus

EM-boh-lus

/ˈɛmbələs/

A blood clot, air bubble, piece of fatty deposit, or other object which has been carried in the bloodstream to lodge in a vessel.

Embryo

EM-bree-oh

/ˈɛmbrioʊ/

An unborn or unhatched offspring in the process of development, in humans up to the eighth week after fertilization.

Embryology

em-bree-OL-oh-jee

/ˌɛmbriˈɒlədʒi/

The branch of biology and medicine concerned with the study of embryos and their development.

Emesis

EM-eh-sis

/ˈɛməsɪs/

The action or process of vomiting.

Emetic

eh-MET-ik

/ɪˈmɛtɪk/

A substance that causes vomiting.

Emmetropia

em-eh-TROH-pee-ah

/ˌɛmɪˈtroʊpiə/

The normal refractive condition of the eye in which with accommodation relaxed parallel rays of light are focused on the retina.

Emollient

ee-MOL-yent

/ɪˈmɒliənt/

A preparation that softens and soothes the skin.

Emphysema

em-fih-SEE-mah

/ˌɛmfɪˈsiːmə/

A condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness.

Empiric

em-PEER-ik

/ɛmˈpɪrɪk/

Based on observation or experience rather than theory or pure logic; often used to describe starting treatment before a definitive diagnosis is made.

Empyema

em-py-EE-mah

/ˌɛmpaɪˈiːmə/

A collection of pus in a body cavity, most commonly in the pleural space between the lungs and the inner chest wall.

Enamel

ee-NAM-ul

/ɪˈnæməl/

The hard, calcified substance that covers the crown of a tooth.

Encephalitis

en-sef-ah-LY-tis

/ɛnˌsɛfəˈlaɪtɪs/

Inflammation of the brain, often caused by an infection or an allergic reaction.

Encephalon

en-SEF-ah-lon

/ɛnˈsɛfəlɒn/

The technical term for the brain.

Encephalopathy

en-sef-ah-LOP-ah-thee

/ɛnˌsɛfəˈlɒpəθi/

Any disease or condition that alters brain function or structure.

End-diastolic volume

END dy-ah-STOL-ik VOL-yoom

/ɛnd ˌdaɪəˈstɒlɪk ˈvɒljuːm/

The volume of blood in a ventricle at the end of filling (diastole), just before contraction (systole).

Endemic

en-DEM-ik

/ɛnˈdɛmɪk/

A disease or condition regularly found among particular people or in a certain area.

Endoangiitis

en-doh-an-jee-EYE-tis

/ˌɛndoʊˌændʒiˈaɪtɪs/

Inflammation of the inner lining of a blood vessel.

Endocarditis

en-doh-kar-DY-tis

/ˌɛndoʊkɑːrˈdaɪtɪs/

Inflammation of the endocardium (the inner lining of the heart), usually involving the heart valves.

Endocardium

en-doh-KAR-dee-um

/ˌɛndoʊˈkɑːrdiəm/

The thin, smooth membrane which lines the inside of the chambers of the heart.

Endocervix

en-doh-SER-viks

/ˌɛndoʊˈsɜːrvɪks/

The mucous membrane lining the canal of the cervix of the uterus.

Endocrine

EN-doh-krin

/ˈɛndəkrɪn/

Relating to glands which secrete hormones or other products directly into the blood.

Endocytosis

en-doh-sy-TOH-sis

/ˌɛndoʊsaɪˈtoʊsɪs/

The cellular process in which substances are brought into the cell by engulfing them in a vacuole.

Endogenous

en-DOJ-eh-nus

/ɛnˈdɒdʒənəs/

Having an internal cause or origin; produced within an organism, tissue, or cell.

Endolymph

EN-doh-limf

/ˈɛndoʊlɪmf/

The fluid contained in the membranous labyrinth of the inner ear.

Endometriosis

en-doh-mee-tree-OH-sis

/ˌɛndoʊˌmiːtriˈoʊsɪs/

A condition where tissue similar to the lining of the uterus grows outside the uterus.

Endometrium

en-doh-MEE-tree-um

/ˌɛndoʊˈmiːtriəm/

The mucous membrane lining the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.

Endorphins

en-DOR-finz

/ɛnˈdɔːrfɪnz/

A group of hormones secreted within the brain and nervous system that activate the body's opiate receptors and have a painkilling effect.

Endoscopy

en-DOS-koh-pee

/ɛnˈdɒskəpi/

A procedure in which an instrument is introduced into the body to give a view of its internal parts.

Endosteum

en-DOS-tee-um

/ɛnˈdɒstiəm/

A thin vascular membrane of connective tissue that lines the inner surface of the bony tissue that forms the medullary cavity of long bones.

Endothelium

en-doh-THEE-lee-um

/ˌɛndoʊˈθiːliəm/

The tissue which forms a single layer of cells lining various organs and cavities of the body, especially the blood vessels and heart.

Endotoxin

en-doh-TOK-sin

/ˌɛndoʊˈtɒksɪn/

A toxin that is present inside a bacterial cell and is released when the cell disintegrates.

Endotracheal

en-doh-TRAY-kee-al

/ˌɛndoʊˈtreɪkiəl/

Situated or occurring within the trachea.

Enema

EN-eh-mah

/ˈɛnɪmə/

A procedure in which liquid or gas is injected into the rectum, typically to expel its contents.

Enophthalmos

en-of-THAL-mos

/ˌɛnɒfˈθælmɒs/

Posterior displacement of the eyeball within the orbit; a 'sunken' eye.

Enosid

EN-oh-sid

/ˈɛnoʊsɪd/

A term relating to certain chemical compounds found in specific biological secretions.

Ensiform

EN-sih-form

/ˈɛnsɪfɔːrm/

Sword-shaped; another name for the xiphoid process at the bottom of the sternum.

Enteritis

en-ter-EYE-tis

/ˌɛntəˈraɪtɪs/

Inflammation of the intestine, especially the small intestine, usually accompanied by diarrhea.

Enterocele

EN-ter-oh-seel

/ˈɛntərəˌsiːl/

A protrusion of a portion of the small intestine into the vagina; a type of pelvic organ prolapse.

Enterocolitis

en-ter-oh-koh-LY-tis

/ˌɛntəroʊkoʊˈlaɪtɪs/

Inflammation of both the small intestine and the colon.

Enterostomy

en-ter-OS-toh-mee

/ˌɛntəˈrɒstəmi/

A surgical procedure to create an opening into the small intestine through the abdominal wall.

Entropion

en-TROH-pee-on

/ɛnˈtroʊpiɒn/

A medical condition in which the eyelid (usually the lower lid) folds inward, causing the eyelashes to rub against the cornea.

Enucleation

ee-noo-klee-AY-shun

/iːˌnuːkliˈeɪʃən/

The surgical removal of an entire organ or structure without rupture, such as the eyeball or a cyst.

Enuresis

en-yoo-REE-sis

/ˌɛnjʊˈriːsɪs/

Involuntary urination, especially by children at night.

Enzyme

EN-zym

/ˈɛnzaɪm/

A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.

Enzyme

EN-zym

/ˈɛnzaɪm/

A biological catalyst that accelerates chemical reactions in the body.

Eosinophil

ee-oh-SIN-oh-fil

/ˌiːəˈsɪnəfɪl/

A type of disease-fighting white blood cell, often indicating a parasitic infection, an allergic reaction, or cancer.

Ependyma

eh-PEN-dih-mah

/ɛˈpɛndɪmə/

The thin membrane of glial cells lining the ventricles of the brain and the central canal of the spinal cord.

Epianesthesia

ep-ee-an-es-THEE-zhah

/ˌɛpiˌænəsˈθiːziə/

Anesthesia on or upon the surface of a part of the body.

Epicanthus

ep-ih-KAN-thus

/ˌɛpɪˈkænθəs/

A vertical fold of skin on either side of the nose, covering the inner corner of the eye.

Epicardium

ep-ih-KAR-dee-um

/ˌɛpɪˈkɑːrdiəm/

A serous membrane that forms the innermost layer of the pericardium and the outer surface of the heart.

Epicondyle

ep-ih-KON-dyl

/ˌɛpɪˈkɒndaɪl/

A protuberance above or on the condyle of a long bone, especially either of the two at the elbow end of the humerus.

Epicranium

ep-ih-KRAY-nee-um

/ˌɛpɪˈkreɪniəm/

The structures covering the cranium, including the scalp and muscles.

Epidemic

ep-ih-DEM-ik

/ˌɛpɪˈdɛmɪk/

A widespread occurrence of an infectious disease in a community at a particular time.

Epidemiology

ep-ih-dee-mee-OL-oh-jee

/ˌɛpɪˌdiːmiˈɒlədʒi/

The branch of medicine which deals with the incidence, distribution, and possible control of diseases.

Epidermis

ep-ih-DER-mis

/ˌɛpɪˈdɜːrmɪs/

The surface epithelium of the skin, overlying the dermis.

Epididymis

ep-ih-DID-ih-mis

/ˌɛpɪˈdɪdɪmɪs/

A highly convoluted duct behind the testis, along which sperm passes to the vas deferens.

Epidural

ep-ih-DOOR-al

/ˌɛpɪˈdjʊərəl/

On or around the dura mater, typically referring to an anesthetic injected into the epidural space of the spinal cord.

Epigastrium

ep-ih-GAS-tree-um

/ˌɛpɪˈɡæstriəm/

The part of the upper abdomen immediately over the stomach.

Epiglottis

ep-ih-GLOT-is

/ˌɛpɪˈɡlɒtɪs/

A flap of cartilage at the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.

Epilepsy

EP-ih-lep-see

/ˈɛpɪlɛpsi/

A neurological disorder marked by sudden recurrent episodes of sensory disturbance, loss of consciousness, or convulsions, associated with abnormal electrical activity in the brain.

Epileptiform

ep-ih-LEP-tih-form

/ˌɛpɪˈlɛptɪfɔːrm/

Resembling epilepsy or its manifestations, such as certain types of seizures or EEG patterns.

Epimysium

ep-ih-MIZ-ee-um

/ˌɛpɪˈmɪziəm/

A sheath of fibrous elastic tissue surrounding a muscle.

Epinephrine

ep-ih-NEF-rin

/ˌɛpɪˈnɛfrɪn/

Another term for adrenaline; a hormone secreted by the adrenal glands, especially in conditions of stress.

Epinephrine

ep-ih-NEF-rin

/ˌɛpɪˈnɛfrɪn/

A hormone and neurotransmitter involved in the 'fight or flight' response; also called adrenaline.

Epiphysis

eh-PIF-ih-sis

/ɪˈpɪfɪsɪs/

The end part of a long bone, initially growing separately from the shaft.

Episclera

ep-ih-SKLEER-ah

/ˌɛpɪˈsklɪərə/

The outermost layer of the sclera (the white of the eye).

Episiotomy

eh-piz-ee-OT-oh-mee

/ɪˌpɪziˈɒtəmi/

A surgical cut made at the opening of the vagina during childbirth, to aid a difficult delivery and prevent rupture of tissues.

Epispadias

ep-ih-SPAY-dee-as

/ˌɛpɪˈspeɪdiəs/

A rare congenital abnormality where the urethral opening is on the upper surface of the penis or near the clitoris.

Epistaxis

ep-ih-STAK-sis

/ˌɛpɪˈstæksɪs/

The medical term for a nosebleed.

Episthotonos

eh-pis-THOT-oh-nus

/ˌɛpɪsˈθɒtənəs/

Spasmodic tetanic curving of the body forward.

Epistropheus

ep-ih-STROH-fee-us

/ˌɛpɪˈstroʊfiəs/

The second cervical vertebra, more commonly known as the axis.

Epitestosterone

ep-ee-tes-TOS-ter-ohn

/ˌɛpɪtɛˈstɒstəˌroʊn/

A natural steroid that is an epimer of testosterone, often measured in drug testing to detect exogenous testosterone use.

Epithelium

ep-ih-THEE-lee-um

/ˌɛpɪˈθiːliəm/

Thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.

Eponychium

ep-oh-NIK-ee-um

/ˌɛpəˈnɪkiəm/

The thickened layer of skin at the base of a fingernail or toenail; commonly called the cuticle.

Epoprostenol

ep-oh-pros-TEN-ol

/ˌɛpəˈprɒstənɒl/

A pharmaceutical form of prostacyclin used to treat pulmonary arterial hypertension.

Epulis

eh-PYOO-lis

/ɪˈpjuːlɪs/

Any tumor-like enlargement of the gums or alveolar mucosa.

Equilibrium

ee-kwih-LIB-ree-um

/ˌiːkwɪˈlɪbriəm/

A state of physical balance; in biochemistry, a state in which opposite forces or influences are balanced.

Erb's Palsy

ERBZ PAWL-zee

/ɜːrbz ˈpɔːlzi/

Paralysis of the arm caused by injury to the upper group of the arm's main nerves (brachial plexus), specifically the C5–C6 nerve roots.

Erector Spinae

ee-REK-tor SPY-nee

/ɪˈrɛktər ˈspaɪniː/

A group of muscles and tendons which run more or less the length of the spine on the left and right, helping to straighten the back.

Erepsin

eh-REP-sin

/ɪˈrɛpsɪn/

A complex of enzymes in the intestinal juice that completes the digestion of proteins by converting polypeptides into amino acids.

Ergonomics

er-goh-NOM-iks

/ˌɜːrɡəˈnɒmɪks/

The study of people's efficiency in their working environment, often used to prevent musculoskeletal disorders.

Ergotamine

er-GOT-ah-meen

/ərˈɡɒtəmiːn/

An alkaloid derived from ergot used in the treatment of migraine headaches.

Erogenous

eh-ROJ-eh-nus

/ɪˈrɒdʒənəs/

Sensitive to sexual stimulation; applied to specific areas of the body.

Erosion

ee-ROH-zhun

/ɪˈroʊʒən/

The gradual destruction of tissue, such as a gastric ulcer eroding the stomach lining or the wearing away of tooth enamel.

Erotomania

eh-roh-toh-MAY-nee-ah

/ɪˌrɒtəˈmeɪniə/

A psychological disorder in which a person has a delusional belief that another person is in love with them.

Eructation

ee-ruk-TAY-shun

/ˌiːrʌkˈteɪʃən/

The act of belching or burping.

Eructation

ee-ruk-TAY-shun

/ˌiːrʌkˈteɪʃən/

The oral expulsion of gas from the stomach; a belch.

Eruption

ee-RUP-shun

/ɪˈrʌpʃən/

The appearance of a rash or skin lesion; also the process of a tooth breaking through the gum.

Erythema

er-ih-THEE-mah

/ˌɛrɪˈθiːmə/

Superficial reddening of the skin, usually in patches, as a result of injury or irritation causing dilatation of the blood capillaries.

Erythralgia

er-ih-THRAL-jah

/ˌɛrɪˈθrældʒə/

Painful redness of the skin.

Erythremia

er-ih-THREE-mee-ah

/ˌɛrɪˈθriːmiə/

An abnormal increase in the number of red blood cells; also known as polycythemia vera.

Erythritol

eh-RITH-rih-tol

/ɪˈrɪθrɪˌtɒl/

A sugar alcohol used as a low-calorie sweetener.

Erythroblast

eh-RITH-roh-blast

/ɪˈrɪθrəˌblæst/

An immature red blood cell that still possesses a nucleus.

Erythrocyte

eh-RITH-roh-syt

/ɪˈrɪθrəˌsaɪt/

A red blood cell that (in humans) is typically a biconcave disc without a nucleus, containing hemoglobin.

Erythroderma

eh-rith-roh-DER-mah

/ɪˌrɪθroʊˈdɜːrmə/

Intense and usually widespread reddening of the skin due to inflammatory disease.

Erythromycin

eh-rith-roh-MY-sin

/ɪˌrɪθroʊˈmaɪsɪn/

An antibiotic used to treat various bacterial infections, often for patients allergic to penicillin.

Erythropoiesis

eh-rith-roh-poy-EE-sis

/ɪˌrɪθroʊpɔɪˈiːsɪs/

The production of red blood cells.

Erythropoietin

eh-rith-roh-POY-eh-tin

/ɪˌrɪθroʊˈpɔɪətɪn/

A hormone produced primarily by the kidneys that plays a key role in the production of red blood cells (EPO).

Escape rhythm

es-KAYP RITH-um

/ɪˈskeɪp ˈrɪðəm/

A compensatory heart rhythm that arises when the normal pacemaker (SA node) fails.

Eschar

ES-kar

/ˈɛskɑːr/

A dry, dark scab or falling away of dead skin, typically caused by a burn, infection, or necrotic skin disease.

Escharotomy

es-kar-OT-oh-mee

/ˌɛskəˈrɒtəmi/

A surgical procedure used to treat full-thickness circumferential burns by incising the eschar to relieve pressure.

Escharotomy

es-kar-OT-oh-mee

/ˌɛskəˈrɒtəmi/

A surgical procedure used to treat full-thickness circumferential burns by incising the eschar to relieve pressure.

Esculent

ES-kyoo-lent

/ˈɛskjʊlənt/

Fit to be eaten; edible. Often used in nutritional medicine regarding dietary choices.

Esculent

ES-kyoo-lent

/ˈɛskjʊlənt/

Fit to be eaten; edible. Often used in nutritional medicine regarding dietary choices.

Esmarch bandage

ES-mark BAN-dij

/ˈɛsmɑːrk ˈbændɪdʒ/

A narrow strip of rubber used to expel blood from a limb before surgery and to maintain a bloodless field.

Esmarch bandage

ES-mark BAN-dij

/ˈɛsmɑːrk ˈbændɪdʒ/

A narrow strip of rubber used to expel blood from a limb before surgery and to maintain a bloodless field.

Esophagoscopy

ee-sof-ah-GOS-koh-pee

/ɪˌsɒfəˈɡɒskəpi/

A procedure in which a flexible endoscope is inserted through the mouth or nose to view the esophagus.

Esophagus

ee-SOF-ah-gus

/ɪˈsɒfəɡəs/

The part of the alimentary canal that connects the throat to the stomach; the gullet.

Esophoria

es-oh-FOR-ee-ah

/ˌɛsoʊˈfɔːriə/

A condition in which there is a tendency for the eyes to turn inward toward the nose.

Esophoria

es-oh-FOR-ee-ah

/ˌɛsoʊˈfɔːriə/

A condition in which there is a tendency for the eyes to turn inward toward the nose.

Esotropia

es-oh-TROH-pee-ah

/ˌɛsoʊˈtroʊpiə/

A form of strabismus (eye misalignment) in which one or both eyes turn inward; commonly called cross-eyed.

Esotropia

es-oh-TROH-pee-ah

/ˌɛsoʊˈtroʊpiə/

A form of strabismus (eye misalignment) in which one or both eyes turn inward; commonly called cross-eyed.

Essential amino acids

eh-SEN-shul ah-MEE-noh AS-idz

/ɪˈsɛnʃəl əˈmiːnoʊ ˈæsɪdz/

Amino acids that cannot be synthesized by the body and must be obtained from the diet.

Essential amino acids

eh-SEN-shul ah-MEE-noh AS-idz

/ɪˈsɛnʃəl əˈmiːnoʊ ˈæsɪdz/

Amino acids that cannot be synthesized by the body and must be obtained from the diet.

Essential hypertension

eh-SEN-shul hy-per-TEN-shun

/ɪˈsɛnʃəl ˌhaɪpərˈtɛnʃən/

High blood pressure that doesn't have a known secondary cause; also called primary hypertension.

Essential hypertension

eh-SEN-shul hy-per-TEN-shun

/ɪˈsɛnʃəl ˌhaɪpərˈtɛnʃən/

High blood pressure that doesn't have a known secondary cause; also called primary hypertension.

Esterase

ES-ter-ays

/ˈɛstəreɪs/

An enzyme that catalyzes the hydrolysis of an ester into an alcohol and an acid.

Esterase

ES-ter-ays

/ˈɛstəreɪs/

An enzyme that catalyzes the hydrolysis of an ester into an alcohol and an acid.

Estradiol

es-trah-DY-ol

/ˌɛstrəˈdaɪɒl/

The most potent and prevalent form of mammalian estrogenic hormone.

Estradiol

es-trah-DY-ol

/ˌɛstrəˈdaɪɒl/

The most potent and prevalent form of mammalian estrogenic hormone.

Estriols

ES-tree-olz

/ˈɛstriɒlz/

A weak estrogen, mostly produced during pregnancy by the placenta.

Estriols

ES-tree-olz

/ˈɛstriɒlz/

A weak estrogen, mostly produced during pregnancy by the placenta.

Estrogen

ES-troh-jen

/ˈɛstrədʒən/

Any of a group of steroid hormones which promote the development and maintenance of female characteristics of the body.

Estrogens

ES-troh-jenz

/ˈɛstrədʒənz/

A group of hormones that primarily influence the female reproductive system and secondary sex characteristics.

Estrogens

ES-troh-jenz

/ˈɛstrədʒənz/

A group of hormones that primarily influence the female reproductive system and secondary sex characteristics.

Estrone

ES-trohn

/ˈɛstroʊn/

The least prevalent of the three main estrogens, primarily produced after menopause.

Estrone

ES-trohn

/ˈɛstroʊn/

The least prevalent of the three main estrogens, primarily produced after menopause.

Ethanol

ETH-ah-nol

/ˈɛθənɒl/

The primary alcohol in alcoholic beverages; used medically as an antiseptic and solvent.

Ethanolamine

eth-ah-NOL-ah-meen

/ˌɛθəˈnɒləmiːn/

A viscous hygroscopic amino alcohol used in the synthesis of surface-active agents and pharmaceuticals.

Ethanolamine

eth-ah-NOL-ah-meen

/ˌɛθəˈnɒləmiːn/

A viscous hygroscopic amino alcohol used in the synthesis of surface-active agents and pharmaceuticals.

Ethmoid Bone

ETH-moyd BOHN

/ˈɛθmɔɪd boʊn/

A square bone at the root of the nose, forming part of the cranium and having many perforations through which the olfactory nerves pass.

Ethmoiditis

eth-moy-DY-tis

/ˌɛθmɔɪˈdaɪtɪs/

Inflammation of the ethmoid sinuses, located between the eyes.

Ethmoiditis

eth-moy-DY-tis

/ˌɛθmɔɪˈdaɪtɪs/

Inflammation of the ethmoid sinuses, located between the eyes.

Ethyl chloride

ETH-ul KLOR-yd

/ˈɛθəl ˈklɔːraɪd/

A topical anesthetic used to numb a small area of skin before minor surgery or injections.

Ethyl chloride

ETH-ul KLOR-yd

/ˈɛθəl ˈklɔːraɪd/

A topical anesthetic used to numb a small area of skin before minor surgery or injections.

Etiology

ee-tee-OL-oh-jee

/ˌiːtiˈɒlədʒi/

The cause, set of causes, or manner of causation of a disease or condition.

Euchromatin

yoo-KROH-mah-tin

/juːˈkroʊmətɪn/

A lightly packed form of chromatin that is enriched in genes and is often under active transcription.

Euchromatin

yoo-KROH-mah-tin

/juːˈkroʊmətɪn/

A lightly packed form of chromatin that is enriched in genes and is often under active transcription.

Euphoria

yoo-FOR-ee-ah

/juːˈfɔːriə/

A feeling or state of intense excitement and happiness; can be a clinical sign of drug use or certain mental states.

Eupnea

yoop-NEE-ah

/juːpˈniːə/

Normal, good, unlabored breathing, sometimes known as quiet breathing or resting respiratory rate.

Eupnea

yoop-NEE-ah

/juːpˈniːə/

Normal, good, unlabored breathing, sometimes known as quiet breathing or resting respiratory rate.

Eustachian Tube

yoo-STAY-shun TOOB

/juːˈsteɪʃən tjuːb/

A narrow passage leading from the pharynx to the cavity of the middle ear, permitting the equalization of air pressure on each side of the eardrum.

Euthanasia

yoo-thah-NAY-zhah

/ˌjuːθəˈneɪʒə/

The painless killing of a patient suffering from an incurable and painful disease or in an irreversible coma.

Euthyroid

yoo-THY-royd

/juːˈθaɪrɔɪd/

Having a normally functioning thyroid gland.

Euthyroid

yoo-THY-royd

/juːˈθaɪrɔɪd/

Having a normally functioning thyroid gland.

Evacuation

ee-vak-yoo-AY-shun

/ɪˌvækjʊˈeɪʃən/

The process of emptying the bowels or removing the contents of a body cavity.

Evacuation

ee-vak-yoo-AY-shun

/ɪˌvækjʊˈeɪʃən/

The process of emptying the bowels or removing the contents of a body cavity.

Eversion

ee-VER-zhun

/ɪˈvɜːrʒən/

The act of turning inside out or rotating outward, such as the sole of the foot turning away from the midline.

Evisceration

ee-vis-er-AY-shun

/ɪˌvɪsəˈreɪʃən/

The removal of internal organs; in ophthalmology, the removal of the contents of the eyeball, leaving the sclera intact.

Evisceration

ee-vis-er-AY-shun

/ɪˌvɪsəˈreɪʃən/

The removal of internal organs; in ophthalmology, the removal of the contents of the eyeball, leaving the sclera intact.

Evolution

ev-oh-LOO-shun

/ˌɛvəˈluːʃən/

The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms.

Exacerbate

eg-ZAS-er-bayt

/ɪɡˈzæsərˌbeɪt/

To make a problem, bad situation, or negative feeling (such as pain or a disease) worse.

Exacerbation

eg-zas-er-BAY-shun

/ɪɡˌzæsərˈbeɪʃən/

An increase in the severity of a disease or its signs and symptoms.

Exanthem

ek-ZAN-them

/ɛɡˈzænθəm/

A skin rash accompanying a disease or fever.

Exanthema

ek-san-THEE-mah

/ˌɛksænˈθiːmə/

A widespread rash, usually in children, often accompanied by systemic symptoms such as fever, malaise, and headache.

Excision

ek-SIZH-un

/ɪkˈsɪʒən/

The act of removing something by cutting, such as a tumor or an organ.

Excitability

ek-sy-tah-BIL-ih-tee

/ɪkˌsaɪtəˈbɪlɪti/

The property of a cell (like a neuron or muscle fiber) that allows it to respond to a stimulus by generating an electrical impulse.

Excitotoxin

ek-SY-toh-tok-sin

/ɪkˈsaɪtoʊˌtɒksɪn/

A substance that overstimulates neurotransmitter receptors, potentially leading to nerve cell damage or death.

Excoriate

ek-SKOR-ee-ayt

/ɪkˈskɔːriˌeɪt/

To damage or remove part of the surface of the skin, often by scratching or chemical irritation.

Excoriation

ek-skoh-ree-AY-shun

/ɪkˌskɔːriˈeɪʃən/

A place where the skin is scraped or abraded, often due to scratching.

Excreta

ek-SKREE-tah

/ɪkˈskriːtə/

Waste matter (such as sweat, urine, or feces) discharged from the body.

Excretion

ek-SKREE-shun

/ɪkˈskriːʃən/

The process of eliminating or expelling waste matter from the body.

Exencephaly

ek-sen-SEF-ah-lee

/ˌɛksɛnˈsɛfəli/

A rare malformation where the brain is located outside of the skull, usually occurring during embryonic development.

Exenteration

ek-sen-ter-AY-shun

/ɪkˌsɛntəˈreɪʃən/

The surgical removal of the entire contents of a body cavity, such as the orbit (eye socket) or pelvis.

Exercise-induced asthma

EK-ser-syz in-DOOST AZ-mah

/ˈɛksərsaɪz ɪnˈdjuːst ˈæzmə/

A narrowing of the airways in the lungs triggered by strenuous physical activity.

Exfoliation

eks-foh-lee-AY-shun

/ɛksˌfoʊliˈeɪʃən/

The shedding of the outermost layer of tissue, such as skin or scales.

Exhalation

eks-hah-LAY-shun

/ˌɛkshəˈleɪʃən/

The process of breathing out.

Exocrine

EK-soh-krin

/ˈɛksəkrɪn/

Relating to glands that secrete their products through ducts onto an epithelial surface (e.g., sweat or salivary glands).

Exocytosis

ek-soh-sy-TOH-sis

/ˌɛksoʊsaɪˈtoʊsɪs/

A process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.

Exogenous

ek-SOJ-eh-nus

/ɛkˈsɒdʒənəs/

Relating to or developing from external factors; originating outside the organism.

Exon

EK-son

/ˈɛksɒn/

A segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence.

Exophthalmos

ek-sof-THAL-mos

/ˌɛksɒfˈθælmɒs/

Abnormal protrusion of the eyeball or eyeballs, often seen in Graves' disease.

Exophthalmos

ek-sof-THAL-mos

/ˌɛksɒfˈθælmɒs/

Abnormal protrusion of the eyeball or eyeballs.

Exostosis

ek-sos-TOH-sis

/ˌɛksɒˈstoʊsɪs/

A benign outgrowth of cartilaginous tissue on a bone.

Exostosis

ek-sos-TOH-sis

/ˌɛksɒˈstoʊsɪs/

A benign outgrowth of cartilaginous tissue on a bone.

Exotoxin

ek-soh-TOK-sin

/ˌɛksoʊˈtɒksɪn/

A toxin released by a living bacterial cell into its surroundings.

Exotoxin

ek-soh-TOK-sin

/ˌɛksoʊˈtɒksɪn/

A toxin released by a living bacterial cell into its surroundings.

Expectoration

ek-spek-toh-RAY-shun

/ɪkˌspɛktəˈreɪʃən/

The act of coughing up and spitting out mucus or phlegm from the respiratory tract.

Expectoration

ek-spek-toh-RAY-shun

/ɪkˌspɛktəˈreɪʃən/

The act of coughing up and spitting out mucus from the respiratory tract.

Expiration

ek-spih-RAY-shun

/ˌɛkspɪˈreɪʃən/

The end of a period of time; in medicine, the act of breathing out or the cessation of life.

Expiratory reserve volume

eks-PY-rah-tor-ee ree-ZERV VOL-yoom

/ɪkˈspaɪrətɔːri rɪˈzɜːrv ˈvɒljuːm/

The additional amount of air that can be expired from the lungs by determined effort after normal expiration.

Exsanguinate

ek-SANG-gwih-nayt

/ɪkˈsæŋɡwɪneɪt/

To drain of blood; to cause a severe or fatal loss of blood.

Exsanguination

eks-sang-gwih-NAY-shun

/ɛkˌsæŋɡwɪˈneɪʃən/

Severe loss of blood; the act of draining a body of blood.

Exstrophy

EK-stroh-fee

/ˈɛkstrəfi/

A congenital malformation in which a hollow organ (typically the bladder) is turned inside out or open to the outside of the body.

Extension

ek-STEN-shun

/ɪkˈstɛnʃən/

A straightening movement that increases the angle between body parts.

Extensor

ek-STEN-sor

/ɪkˈstɛnsər/

A muscle whose contraction extends or straightens a limb or other part of the body.

Extravasation

eks-trav-ah-SAY-shun

/ɛkˌstrævəˈseɪʃən/

The leakage of fluid (such as intravenous medication or blood) from its container (such as a vessel) into the surrounding tissue.

Extrinsic

ek-STRIN-sik

/ɛkˈstrɪnsɪk/

Not part of the essential nature of someone or something; coming or derived from outside.

Extroversion

eks-troh-VER-zhun

/ˌɛkstrəˈvɜːrʒən/

A personality trait characterized by outgoingness and a preference for social interaction; also refers to turning an organ inside out.

Exudate

EKS-yoo-dayt

/ˈɛksjʊdeɪt/

A mass of cells and fluid that has seeped out of blood vessels or an organ, especially in inflammation.

Exudate

EKS-yoo-dayt

/ˈɛksjʊdeɪt/

A mass of cells and fluid that has seeped out of blood vessels or an organ, especially in inflammation.