MedTerm Speak

Master the language of medicine

Macroglossia

mak-roh-GLOSS-ee-ah

/ˌmækroʊˈɡlɒsiə/

Abnormal enlargement of the tongue.

Macrophthalmia

mak-rof-THAL-mee-ah

/ˌmækrɒfˈθælmiə/

Abnormal enlargement of the eyeball.

Macroscopic

mak-roh-SKOP-ik

/ˌmækroʊˈskɒpɪk/

Visible to the naked eye; not microscopic.

Macular edema

MAK-yoo-lar eh-DEE-mah

/ˈmækjʊlər ɪˈdiːmə/

Fluid buildup and swelling in the macula of the eye.

Malignant hypertension

mah-LIG-nant hy-per-TEN-shun

/məˈlɪɡnənt ˌhaɪpərˈtɛnʃən/

Extremely high blood pressure that develops rapidly and causes organ damage.

Malignant melanoma

mah-LIG-nant mel-ah-NOH-mah

/məˈlɪɡnənt ˌmɛləˈnoʊmə/

A dangerous form of skin cancer that begins in melanocytes.

Malleable

MAL-ee-ah-bul

/ˈmæliəbəl/

Capable of being shaped or bent; often used to describe certain surgical instruments.

Malunion

mal-YOON-yun

/mælˈjuːnjən/

Healing of a fractured bone in a poor position.

Mandible

MAN-dih-bul

/ˈmændɪbəl/

The lower jawbone; the largest and strongest bone of the face.

Mandibular

man-DIB-yoo-lar

/mænˈdɪbjʊlər/

Pertaining to the mandible or lower jaw.

Manganese

MANG-gah-neez

/ˈmæŋɡəniːz/

A trace mineral essential for bone formation and metabolic functions.

Mania

MAY-nee-ah

/ˈmeɪniə/

A mental state characterized by very high energy, excitement, and racing thoughts.

Mantle

MAN-tul

/ˈmæntəl/

The cerebral cortex; the outer layer of gray matter in the brain.

Manubriosternal

mah-noo-bree-oh-STER-nul

/məˌnuːbrioʊˈstɜːrnəl/

Relating to the joint between the manubrium and the body of the sternum.

Manubrium

mah-NOO-bree-um

/məˈnuːbriəm/

The broad upper part of the sternum (breastbone).

Mapping

MAP-ing

/ˈmæpɪŋ/

The localization of specific areas, such as brain mapping or genetic mapping.

Marasmus

mah-RAZ-mus

/məˈræzməs/

Severe undernourishment causing an infant's or child's weight to be significantly low for their age.

Marrow

MAIR-oh

/ˈmæroʊ/

The soft fatty substance in the cavities of bones, in which blood cells are produced.

Mask of pregnancy

MASK of PREG-nan-see

/mæsk əv ˈprɛɡnənsi/

Melasma; dark patches on the face that occur during pregnancy.

Masseter

mas-SEE-ter

/mæˈsiːtər/

A powerful muscle that facilitates chewing, located in the cheek.

Mastectomy

mas-TEK-toh-mee

/mæˈstɛktəmi/

Surgical removal of one or both breasts, partially or completely.

Mastication

mas-tih-KAY-shun

/ˌmæstɪˈkeɪʃən/

The medical term for chewing.

Mastitis

mas-TY-tis

/mæˈstaɪtɪs/

Inflammation of the breast tissue, often involving an infection.

Mastoid process

MAS-toyd PROS-es

/ˈmæstɔɪd ˈprɒsɛs/

A conical prominence of the temporal bone behind the ear.

Mastopexy

MAS-toh-pek-see

/ˈmæstəˌpɛksi/

A surgical procedure to raise and firm the breasts by removing excess skin and tightening the surrounding tissue; a breast lift.

Maturation

match-oo-RAY-shun

/ˌmætʃʊˈreɪʃən/

The process of reaching full development or ripening, whether of a cell, a tissue, or an individual.

Maxilla

mak-SIL-ah

/mækˈsɪlə/

The bone that forms the upper jaw and part of the nose and eye sockets.

McBurney's point

mak-BUR-neez POYNT

/məkˈbɜːrniz pɔɪnt/

A point on the abdominal wall that corresponds to the location of the appendix; tenderness here is a classic sign of appendicitis.

Mean arterial pressure

MEEN ar-TEER-ee-ul PRESH-ur

/miːn ɑːrˈtɪəriəl ˈprɛʃər/

MAP; the average arterial pressure during a single cardiac cycle, considered a better indicator of perfusion to vital organs.

Measles

MEE-zulz

/ˈmiːzəlz/

A highly contagious viral disease marked by fever and a characteristic red rash, preventable by the MMR vaccine.

Meatotomy

mee-ah-TOT-oh-mee

/ˌmiːəˈtɒtəmi/

A surgical procedure to enlarge the meatus (opening) of the urethra.

Meatus

mee-AY-tus

/miˈeɪtəs/

A natural body opening or canal (e.g., the external auditory meatus).

Meconium

meh-KOH-nee-um

/mɪˈkoʊniəm/

The dark green substance forming the first feces of a newborn infant.

Medial

MEE-dee-ul

/ˈmiːdiəl/

Anatomical term meaning toward the middle or midline of the body.

Median nerve

MEE-dee-un NERV

/ˈmiːdiən nɜːrv/

A major nerve of the upper limb; compression of this nerve at the wrist causes Carpal Tunnel Syndrome.

Mediastinum

mee-dee-as-TY-num

/ˌmiːdiəˈstaɪnəm/

The central compartment of the chest cavity between the lungs, containing the heart.

Medulla

meh-DUL-ah

/mɪˈdʌlə/

The innermost part of an organ or structure, such as the renal medulla (kidney) or adrenal medulla.

Medulla oblongata

meh-DUL-ah ob-long-GAH-tah

/mɪˈdʌlə ˌɒblɒŋˈɡætə/

The lowest part of the brainstem, controlling autonomic functions like breathing and heart rate.

Megacolon

meg-ah-KOH-lon

/ˌmɛɡəˈkoʊlən/

Abnormal dilation of the colon, often accompanied by paralysis of the bowel movements.

Megakaryocyte

meg-ah-KAIR-ee-oh-syt

/ˌmɛɡəˈkærioʊsaɪt/

A large bone marrow cell responsible for the production of blood platelets.

Megaloblast

MEG-ah-loh-blast

/ˈmɛɡələblæst/

A large, abnormally developed red blood cell precursor.

Meiosis

my-OH-sis

/maɪˈoʊsɪs/

A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell.

Meissner's corpuscles

MYS-nerz KOR-pus-ulz

/ˈmaɪsnərz ˈkɔːrpʌsəlz/

Sensory nerve endings in the skin that are sensitive to light touch.

Melancholia

mel-an-KOH-lee-ah

/ˌmɛlənˈkoʊliə/

A severe form of depression characterized by deep sadness and lack of interest in everything.

Melanin

MEL-ah-nin

/ˈmɛlənɪn/

A dark brown to black pigment occurring in the hair, skin, and iris of the eye.

Melanocyte

meh-LAN-oh-syt

/mɪˈlænəˌsaɪt/

A cell in the skin and eyes that produces the pigment melanin.

Melanoma

mel-ah-NOH-mah

/ˌmɛləˈnoʊmə/

A serious type of skin cancer that develops from the pigment-producing cells.

Melanotic

mel-ah-NOT-ik

/ˌmɛləˈnɒtɪk/

Pertaining to the presence of melanin; often used to describe dark-colored stools (melena).

Melasma

meh-LAZ-mah

/mɪˈlæzmə/

A condition in which brown patches appear on the face, often triggered by hormonal changes or sun exposure.

Melatonin

mel-ah-TOH-nin

/ˌmɛləˈtoʊnɪn/

A hormone primarily released by the pineal gland that regulates the sleep-wake cycle.

Melena

meh-LEE-nah

/məˈliːnə/

Dark sticky feces containing partly digested blood, typically following internal bleeding.

Membrane

MEM-brayn

/ˈmɛmbreɪn/

A thin pliable layer of tissue covering surfaces or separating regions in an organism.

Menarche

meh-NAR-kee

/mɛˈnɑːrki/

The first occurrence of menstruation.

Meninges

meh-NIN-jeez

/mɪˈnɪndʒiːz/

The three membranes (dura mater, arachnoid mater, and pia mater) that line the skull and vertebral canal.

Meningitis

men-in-JY-tis

/ˌmɛnɪnˈdʒaɪtɪs/

Inflammation of the meninges caused by viral or bacterial infection.

Meniscus

meh-NIS-kus

/mɪˈnɪskəs/

A C-shaped piece of tough, rubbery cartilage that acts as a shock absorber between the shinbone and the thighbone.

Menometrorrhagia

men-oh-meh-troh-RAY-jee-ah

/ˌmɛnoʊˌmɛtrəˈreɪdʒə/

A condition characterized by excessive uterine bleeding at both the usual time of menstruation and at irregular intervals.

Menopause

MEN-oh-pawz

/ˈmɛnəˌpɔːz/

The ceasing of menstruation, typically occurring between 45 and 50 years of age.

Menorrhagia

men-oh-RAY-jee-ah

/ˌmɛnəˈreɪdʒə/

Abnormally heavy bleeding at menstruation.

Menstruation

men-stroo-AY-shun

/ˌmɛnstruˈeɪʃən/

The process in a woman of discharging blood and other materials from the lining of the uterus at intervals of about one lunar month.

Mesencephalon

mez-en-SEF-ah-lon

/ˌmɛzɛnˈsɛfəlɒn/

The technical name for the midbrain.

Mesentery

MEZ-en-tair-ee

/ˈmɛzənˌtɛri/

A fold of the peritoneum that attaches the stomach, small intestine, and other organs to the posterior wall of the abdomen.

Mesothelioma

mez-oh-thee-lee-OH-mah

/ˌmɛzoʊˌθiːliˈoʊmə/

A malignant tumor that is caused by inhaled asbestos fibers and forms in the lining of the lungs, abdomen, or heart.

Metabolism

meh-TAB-oh-lizm

/məˈtæbəˌlɪzəm/

The chemical processes that occur within a living organism in order to maintain life.

Metabolism

meh-TAB-oh-lizm

/məˈtæbəˌlɪzəm/

The sum of all chemical reactions in the body, divided into anabolism (building) and catabolism (breaking down).

Metacarpal

met-ah-KAR-pul

/ˌmɛtəˈkɑːrpəl/

Any of the five bones of the hand between the wrist (carpus) and the fingers (phalanges).

Metacarpophalangeal

met-ah-kar-poh-fah-LAN-jee-ul

/ˌmɛtəkɑːrpoʊfəˈlændʒiəl/

MCP; the large joints at the base of the fingers, often called knuckles.

Metamorphopsia

met-ah-mor-FOP-see-ah

/ˌmɛtəmɔːrˈfɒpsiə/

A type of distorted vision in which straight lines appear wavy or bent, often a sign of retinal problems.

Metaphysis

meh-TAF-ih-sis

/mɪˈtæfɪsɪs/

The narrow portion of a long bone between the epiphysis and the diaphysis.

Metaphysis

meh-TAF-ih-sis

/mɪˈtæfɪsɪs/

The growing part of a long bone between the diaphysis (shaft) and the epiphysis (end).

Metaplasia

met-ah-PLAY-zhah

/ˌmɛtəˈpleɪʒə/

The transformation of one type of mature tissue into another, often as a response to chronic irritation.

Metastasis

meh-TAS-tah-sis

/məˈtæstəsɪs/

The development of secondary malignant growths at a distance from a primary site of cancer.

Metatarsal

met-ah-TAR-sul

/ˌmɛtəˈtɑːrsəl/

Any of the bones of the foot between the ankle (tarsus) and the toes (phalanges).

Metatarsalgia

met-ah-tar-SAL-jah

/ˌmɛtətɑːrˈsældʒə/

A condition marked by pain and inflammation in the ball of the foot.

Metformin

met-FOR-min

/mɛtˈfɔːrmɪn/

A first-line medication used to treat type 2 diabetes by lowering glucose production in the liver.

Microangiopathy

my-kroh-an-jee-OP-ah-thee

/ˌmaɪkroʊˌændʒiˈɒpəθi/

A disease of the very small blood vessels (capillaries), frequently a complication of diabetes.

Microbe

MY-krohb

/ˈmaɪkroʊb/

A microorganism, especially a bacterium causing disease or fermentation.

Microcephaly

my-kroh-SEF-ah-lee

/ˌmaɪkroʊˈsɛfəli/

Abnormal smallness of the head, a congenital condition associated with incomplete brain development.

Microembolism

my-kroh-EM-boh-lizm

/ˌmaɪkroʊˈɛmbəˌlɪzəm/

A small embolus (blood clot or air bubble) that obstructs a small blood vessel.

Microglia

my-KROG-lee-ah

/maɪˈkrɒɡliə/

Small glial cells that serve as the primary immune defense in the central nervous system.

Micturition

mik-choo-RISH-un

/ˌmɪktjʊˈrɪʃən/

The medical term for urination.

Micturition reflex

mik-choo-RISH-un REE-fluks

/ˌmɪktjʊˈrɪʃən ˈriːflɛks/

The nervous system reflex that triggers the urge to urinate and coordinates the emptying of the bladder.

Mid-axillary line

MID-ak-SIL-air-ee LYN

/mɪd ækˈsɪlɛri laɪn/

A vertical landmark line starting at the center of the armpit and extending down the side of the chest.

Midbrain

MID-brayn

/ˈmɪdbreɪn/

A small central part of the brainstem, developing from the middle of the primitive or embryonic brain.

Migraine

MY-grayn

/ˈmaɪɡreɪn/

A recurrent throbbing headache that typically affects one side of the head and is often accompanied by nausea and disturbed vision.

Milliequivalent

mil-ee-eh-KWIV-ah-lent

/ˌmɪliɪˈkwɪvələnt/

mEq; a unit of measurement used for electrolytes like sodium and potassium in the blood.

Mineralocorticoid

min-er-al-oh-KOR-tih-koyd

/ˌmɪnərəloʊˈkɔːrtɪkɔɪd/

A class of steroid hormones (like aldosterone) that regulate salt and water balance.

Miosis

my-OH-sis

/maɪˈoʊsɪs/

Excessive constriction of the pupil of the eye.

Miscarriage

MIS-kair-ij

/ˈmɪsˌkærɪdʒ/

The spontaneous loss of a woman's pregnancy before the 20th week.

Mistletoe sign

MIS-ul-toh syn

/ˈmɪsəltoʊ saɪn/

A radiographic appearance where lung shadows resemble mistletoe, sometimes seen in sarcoidosis.

Mitochondria

my-toh-KON-dree-ah

/ˌmaɪtəˈkɒndriə/

Organelles in the cell often called the 'powerhouse,' responsible for creating ATP (energy).

Mitosis

my-TOH-sis

/maɪˈtoʊsɪs/

A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus.

Mitral valve

MY-trul VALV

/ˈmaɪtrəl vælv/

The valve between the left atrium and the left ventricle of the heart, consisting of two tapered cusps.

Mitral valve prolapse

MY-trul VALV PROH-laps

/ˈmaɪtrəl vælv ˈproʊlæps/

MVP; a condition where the heart's mitral valve flaps don't close smoothly, sometimes causing blood to leak backward.

Mobilization

moh-bil-ih-ZAY-shun

/ˌmoʊbɪlɪˈzeɪʃən/

The act of making a part of the body movable; in physical therapy, it refers to moving a joint or limb.

Modified radical mastectomy

MOD-ih-fyd RAD-ih-kul mas-TEK-toh-mee

/ˈmɒdɪfaɪd ˈrædɪkəl mæˈstɛktəmi/

A surgery for breast cancer that removes the entire breast and axillary lymph nodes, but leaves the chest muscles.

Mohs surgery

MOHZ SUR-jer-ee

/moʊz ˈsɜːrdʒəri/

A precise surgical technique used to treat skin cancer by removing thin layers of skin and examining them under a microscope until only cancer-free tissue remains.

Molar

MOH-lar

/ˈmoʊlər/

A grinding tooth at the back of a mammal's mouth.

Molding

MOHL-ding

/ˈmoʊldɪŋ/

The natural process by which a baby's head changes shape to fit through the birth canal during delivery.

Mole

MOHL

/moʊl/

A common skin growth (nevus) made of pigment-forming cells; also a unit of chemical measurement.

Molluscum contagiosum

moh-LUS-kum kon-tay-jee-OH-sum

/məˈlʌskəm kənˌteɪdʒiˈoʊsəm/

A viral skin infection that causes small, painless, pearly bumps.

Monckeberg's arteriosclerosis

MON-keh-bergz ar-TEER-ee-oh-skleh-ROH-sis

/ˈmɒŋkəbɜːrɡz ɑːrˌtɪərioʊsklɪˈroʊsɪs/

Calcium deposits in the muscular layer of medium-sized arteries, usually not blocking blood flow.

Mongolian spot

mon-GOH-lee-un SPOT

/mɒŋˈɡoʊliən spɒt/

A flat, bluish-gray birthmark, common in infants of color, usually found on the lower back or buttocks.

Monoclonal antibody

mon-oh-KLOH-nul AN-tih-bod-ee

/ˌmɒnəˈkloʊnəl ˈæntɪˌbɒdi/

Laboratory-made proteins that mimic the immune system's ability to fight off harmful pathogens or cancer cells.

Monocyte

MON-oh-syt

/ˈmɒnəˌsaɪt/

A type of white blood cell that eventually leaves the blood to become a macrophage in the tissues.

Mononucleosis

mon-oh-noo-klee-OH-sis

/ˌmɒnoʊˌnuːkliˈoʊsɪs/

Often called 'mono', it is an infectious disease usually caused by the Epstein-Barr virus.

Monoplegia

mon-oh-PLEE-jah

/ˌmɒnəˈpliːdʒə/

Paralysis affecting only one limb.

Monosaccharide

mon-oh-SAK-ah-ryd

/ˌmɒnəˈsækəˌraɪd/

The simplest form of sugar, such as glucose or fructose, that cannot be broken down further into simpler sugars.

Mons pubis

MONZ PYOO-bis

/mɒnz ˈpjuːbɪs/

The rounded mass of fatty tissue lying over the joint of the pubic bones.

Mood stabilizer

MOOD STAY-bih-ly-zer

/muːd ˈsteɪbɪˌlaɪzər/

A psychiatric medication used to treat mood disorders characterized by intense shifts, such as bipolar disorder.

Moon face

MOON fays

/muːn feɪs/

A medical sign where the face becomes round and full, typically due to long-term steroid use or Cushing's syndrome.

Morbidity

mor-BID-ih-tee

/mɔːrˈbɪdəti/

The condition of being diseased; the rate of disease in a population.

Moro reflex

MOR-oh REE-fluks

/ˈmɔːroʊ ˈriːflɛks/

The 'startle reflex' in infants, where they throw back their head and extend their arms in response to a loud noise or sudden movement.

Morphine

MOR-feen

/ˈmɔːrfiːn/

A potent opioid analgesic used to treat severe pain, derived from the opium poppy.

Morphology

mor-FOL-oh-jee

/mɔːrˈfɒlədʒi/

The study of the size, shape, and structure of cells or organisms.

Mortality

mor-TAL-ih-tee

/mɔːrˈtæləti/

The state of being subject to death; the death rate in a population.

Mortician

mor-TISH-un

/mɔːrˈtɪʃən/

A person whose job is to prepare dead bodies for burial or cremation.

Morula

MOR-yoo-lah

/ˈmɒrjʊlə/

A solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.

Motility

moh-TIL-ih-tee

/moʊˈtɪləti/

The ability of an organism or fluid to move spontaneously and actively (e.g., sperm motility).

Motor neuron

MOH-tor NOOR-on

/ˈmoʊtər ˈnjʊərɒn/

A nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland.

MRI

EM-AR-EYE

/ˌɛm ɑːr ˈaɪ/

Abbreviation for Magnetic Resonance Imaging.

Mucolytic

myoo-koh-LIT-ik

/ˌmjuːkəˈlɪtɪk/

A medication capable of dissolving or breaking down mucus.

Mucopurulent

myoo-koh-PYOOR-yoo-lent

/ˌmjuːkoʊˈpjʊərʊlənt/

Containing both mucus and pus.

Mucosa

myoo-KOH-sah

/mjuːˈkoʊsə/

A mucous membrane; the moist, inner lining of some organs and body cavities.

Mucous membrane

MYOO-kus MEM-brayn

/ˈmjuːkəs ˈmɛmbreɪn/

The moist, protective lining of body cavities that open to the outside.

Mucus

MYOO-kus

/ˈmjuːkəs/

A slippery secretion produced by, and covering, mucous membranes.

Multifactorial

mul-tih-fak-TOR-ee-al

/ˌmʌltifækˈtɔːriəl/

Involving or dependent on a number of factors, especially genetic and environmental.

Multigravida

mul-tih-GRAV-ih-dah

/ˌmʌltiˈɡrævɪdə/

A woman who is or has been pregnant for at least the second time.

Multilocular

mul-tih-LOK-yoo-lar

/ˌmʌltiˈlɒkjʊlər/

Divided into many small cavities or compartments.

Multiorgan failure

MUL-tih-or-gan FAIL-yur

/ˈmʌltiˌɔːrɡən ˈfeɪljər/

The clinical dysfunction of two or more organ systems in an acutely ill patient.

Multipara

mul-TIP-ah-rah

/mʌlˈtɪpərə/

A woman who has had more than one pregnancy resulting in viable offspring.

Multiple myeloma

MUL-tih-pul my-eh-LOH-mah

/ˈmʌltɪpəl ˌmaɪəˈloʊmə/

A cancer that forms in a type of white blood cell called a plasma cell.

Multiple sclerosis

MUL-tih-pul skleh-ROH-sis

/ˈmʌltɪpəl sklɪˈroʊsɪs/

A chronic disease involving damage to the sheaths of nerve cells in the brain and spinal cord.

Mumps

MUMPS

/mʌmps/

A viral infection that primarily affects the parotid glands near the ears.

Mural thrombus

MYOOR-al THROM-bus

/ˈmjʊərəl ˈθrɒmbəs/

A blood clot that forms on the wall of a large blood vessel or heart chamber.

Murine

MYOOR-een

/ˈmjʊəraɪn/

Relating to mice or rats.

Murmur

MUR-mur

/ˈmɜːrmər/

A recurring sound heard in the heart through a stethoscope that may indicate a problem with a heart valve.

Muscle

MUS-ul

/ˈmʌsəl/

A band or bundle of fibrous tissue in a human or animal body that has the ability to contract.

Muscle tone

MUS-ul TOHN

/ˈmʌsəl toʊn/

The continuous and passive partial contraction of the muscles; tonus.

Muscular dystrophy

MUS-kyoo-lar DIS-troh-fee

/ˈmʌskjʊlər ˈdɪstrəfi/

A hereditary condition marked by progressive weakening and wasting of the muscles.

Musculoskeletal

mus-kyoo-loh-SKEL-eh-tul

/ˌmʌskjʊloʊˈskɛlɪtəl/

Relating to both the muscles and the skeleton.

Mustard gas

MUS-tard GAS

/ˈmʌstərd ɡæs/

A cytotoxic and blister agent used in chemical warfare, leading to severe skin and lung damage.

Mutagen

MYOO-tah-jen

/ˈmjuːtədʒən/

An agent, such as radiation or a chemical substance, which causes genetic mutation.

Mutation

myoo-TAY-shun

/mjuːˈteɪʃən/

The changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations.

Mutism

MYOO-tizm

/ˈmjuːtɪzəm/

Inability or refusal to speak, often due to psychological or neurological factors.

Myalgia

my-AL-jah

/maɪˈældʒə/

Pain in a muscle or group of muscles.

Myasthenia

my-as-THEE-nee-ah

/ˌmaɪəsˈθiːniə/

Muscle weakness.

Myasthenia gravis

my-as-THEE-nee-ah GRAH-vis

/ˌmaɪəsˈθiːniə ˈɡrævɪs/

A condition causing abnormal muscle weakness without atrophy, and which is caused by a defect in nerve impulse transmission.

Mycobacterium

my-koh-bak-TEER-ee-um

/ˌmaɪkoʊbækˈtɪəriəm/

A genus of bacteria that includes the causative agents of tuberculosis and leprosy.

Mycology

my-KOL-oh-jee

/maɪˈkɒlədʒi/

The scientific study of fungi.

Mydriasis

mih-DRY-ah-sis

/mɪˈdraɪəsɪs/

Dilation of the pupil of the eye.

Mydriatic

mid-ree-AT-ik

/ˌmɪdriˈætɪk/

A drug that causes the pupil of the eye to dilate.

Myelencephalon

my-eh-len-SEF-ah-lon

/ˌmaɪəlɛnˈsɛfəlɒn/

The posterior part of the developing vertebrate hindbrain; becomes the medulla oblongata.

Myelin

MY-eh-lin

/ˈmaɪəlɪn/

A mixture of proteins and phospholipids forming a whitish insulating sheath around many nerve fibers.

Myelin sheath

MY-eh-lin SHEETH

/ˈmaɪəlɪn ʃiːθ/

An insulating layer that forms around nerves, allowing electrical impulses to transmit quickly.

Myelitis

my-eh-LY-tis

/ˌmaɪəˈlaɪtɪs/

Inflammation of the spinal cord or of the bone marrow.

Myelocele

MY-eh-loh-seel

/ˈmaɪəloʊsiːl/

A protrusion of the spinal cord through a defect in the vertebral column.

Myelofibrosis

my-eh-loh-fy-BROH-sis

/ˌmaɪəloʊfaɪˈbroʊsɪs/

A rare type of bone marrow cancer that disrupts the normal production of blood cells.

Myelography

my-eh-LOG-rah-fee

/ˌmaɪəˈlɒɡrəfi/

A diagnostic imaging test using a contrast medium to detect pathology of the spinal cord.

Myeloma

my-eh-LOH-mah

/ˌmaɪəˈloʊmə/

A malignant tumor of the bone marrow.

Myelosuppression

my-eh-loh-suh-PRESH-un

/ˌmaɪəloʊsəˈprɛʃən/

A condition in which bone marrow activity is decreased, resulting in fewer red blood cells, white blood cells, and platelets.

Myocardial

my-oh-KAR-dee-ul

/ˌmaɪoʊˈkɑːrdiəl/

Relating to the muscular tissue of the heart (myocardium).

Myocardial infarction

my-oh-KAR-dee-ul in-FARK-shun

/ˌmaɪoʊˈkɑːrdiəl ɪnˈfɑːrkʃən/

Commonly known as a heart attack; the death of heart muscle due to blocked blood flow.

Myocarditis

my-oh-kar-DY-tis

/ˌmaɪoʊkɑːrˈdaɪtɪs/

Inflammation of the heart muscle.

Myoclonus

my-OK-loh-nus

/maɪˈɒklənəs/

Spasmodic jerky contraction of groups of muscles.

Myofibril

my-oh-FY-bril

/ˌmaɪoʊˈfaɪbrɪl/

Any of the elongated contractile threads found in striated muscle cells.

Myoma

my-OH-mah

/maɪˈoʊmə/

A benign tumor of muscular tissue.

Myometrium

my-oh-MEE-tree-um

/ˌmaɪoʊˈmiːtriəm/

The muscular middle layer of the wall of the uterus.

Myopathy

my-OP-ah-thee

/maɪˈɒpəθi/

A disease of muscle tissue.

Myopia

my-OH-pee-ah

/maɪˈoʊpiə/

Nearsightedness; a condition in which close objects appear clearly, but far ones don't.

Myopic

my-OP-ik

/maɪˈɒpɪk/

Relating to or affected by nearsightedness.

Myorrhaphy

my-OR-ah-fee

/maɪˈɔːrəfi/

Surgical suturing of a muscle.

Myosin

MY-oh-sin

/ˈmaɪəsɪn/

A fibrous protein that forms the contractile filaments of muscle cells.

Myotomy

my-OT-oh-mee

/maɪˈɒtəmi/

Surgical incision or cutting of a muscle.

Myringitis

meer-in-JY-tis

/ˌmɪrɪnˈdʒaɪtɪs/

Inflammation of the tympanic membrane (eardrum).

Myringotomy

meer-in-GOT-oh-mee

/ˌmɪrɪŋˈɡɒtəmi/

Surgical incision into the eardrum, typically to relieve pressure or drain fluid.

Myxedema

mik-seh-DEE-mah

/ˌmɪksɪˈdiːmə/

Swelling of the skin and underlying tissues giving a waxy appearance, typical of severe hypothyroidism.

Myxoma

mik-SOH-mah

/mɪkˈsoʊmə/

A benign tumor of connective tissue containing mucous material.

Ménière's disease

men-ee-AIRZ dih-ZEEZ

/mɛniˈɛərz dɪˈziːz/

A disorder of the inner ear that causes episodes of vertigo, tinnitus, and hearing loss.

Nuchal

NOO-kul

/ˈnjuːkəl/

Relating to the nape (back) of the neck.