MedTerm Speak

Master the language of medicine

G-protein

GEE-proh-teen

/ˈdʒiː ˌproʊtiːn/

A family of proteins that act as molecular switches inside cells, transmitting signals from a variety of stimuli outside a cell to its interior.

G-protein coupled receptor

GEE-proh-teen KUP-uld ree-SEP-tor

/ˈdʒiː ˌproʊtiːn ˈkʌpəld rɪˈsɛptər/

A large family of cell surface receptors that respond to a variety of external signals (GPCRs).

Gait

GAYT

/ɡeɪt/

A person's manner of walking, which can be diagnostic of various neurological or muscular conditions.

Gait, Ataxic

GAYT ay-TAK-sik

/ɡeɪt əˈtæksɪk/

An unsteady, staggering gait often seen in patients with cerebellar damage.

Galactagogue

gah-LAK-tah-gog

/ɡəˈlæktəˌɡɒɡ/

A substance that promotes or increases the flow of a mother's milk.

Galactocele

gah-LAK-toh-seel

/ɡəˈlæktəˌsiːl/

A milk-filled cyst caused by the obstruction of a milk duct.

Galactose

gah-LAK-tohs

/ɡəˈlæktoʊs/

A simple sugar that is a constituent of lactose (milk sugar).

Galactosemia

gah-lak-toh-SEE-mee-ah

/ɡəˌlæktoʊˈsiːmiə/

A rare genetic metabolic disorder that affects an individual's ability to metabolize the sugar galactose properly.

Galeazzi fracture

gal-ee-AHT-zee FRAK-chur

/ˌɡæliˈætsi ˈfræktʃər/

A fracture of the distal third of the radius with dislocation of the distal radioulnar joint.

Gallbladder

GAWL-blad-er

/ˈɡɔːlˌblædər/

A small pear-shaped organ beneath the liver, in which bile is stored after secretion by the liver and before release into the intestine.

Gallop rhythm

GAL-op RITH-um

/ˈɡæləp ˈrɪðəm/

An abnormal heart rhythm marked by the presence of three or four heart sounds, resembling the sound of a galloping horse.

Gallstone

GAWL-stohn

/ˈɡɔːlstoʊn/

A small, hard crystalline mass formed in the gallbladder or bile ducts from bile pigments, cholesterol, and calcium salts.

Gamete

GAM-eet

/ˈɡæmiːt/

A mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote.

Gametogenesis

gam-eh-toh-JEN-eh-sis

/ˌɡæmitoʊˈdʒɛnəsɪs/

The process in which cells undergo meiosis to form gametes.

Gamma Globulin

GAM-ah GLOB-yoo-lin

/ˈɡæmə ˈɡlɒbjʊlɪn/

A protein found in blood plasma that contains most of the antibodies; often used to boost immunity against specific diseases.

Ganglion

GANG-glee-on

/ˈɡæŋɡliən/

A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.

Ganglioside

GANG-glee-oh-syd

/ˈɡæŋɡliəˌsaɪd/

A type of sphingolipid found in cell membranes, particularly in the gray matter of the brain.

Gangrene

GANG-green

/ˈɡæŋɡriːn/

Localized death and decomposition of body tissue, resulting from either obstructed circulation or bacterial infection.

Gargoylism

GAR-goyl-izm

/ˈɡɑːrɡɔɪlˌɪzəm/

An older, largely obsolete term for Hurler syndrome, characterized by coarse facial features and skeletal deformities.

Gastralgia

gas-TRAL-jah

/ɡæˈstrældʒə/

Pain in the stomach or the epigastric region.

Gastrectomy

gas-TREK-toh-mee

/ɡæˈstrɛktəmi/

Surgical removal of a part or the whole of the stomach.

Gastric Juice

GAS-trik JOOS

/ˈɡæstrɪk dʒuːs/

A thin, watery, acidic digestive fluid secreted by the stomach glands.

Gastrin

GAS-trin

/ˈɡæstrɪn/

A hormone which stimulates secretion of gastric juice and is secreted into the blood by the stomach wall in response to the presence of food.

Gastrinoma

gas-trih-NOH-mah

/ˌɡæstrɪˈnoʊmə/

A tumor, usually in the pancreas or duodenum, that secretes excessive gastrin, leading to stomach ulcers.

Gastritis

gas-TRY-tis

/ɡæˈstraɪtɪs/

Inflammation of the lining of the stomach.

Gastrocnemius

gas-trok-NEE-mee-us

/ˌɡæstrɒkˈniːmiəs/

The chief muscle of the calf of the leg, which flexes the knee and foot.

Gastroduodenal

gas-troh-doo-oh-DEE-nal

/ˌɡæstroʊˌduːəˈdiːnəl/

Relating to the stomach and the duodenum.

Gastroenteritis

gas-troh-en-ter-EYE-tis

/ˌɡæstroʊˌɛntəˈraɪtɪs/

Inflammation of the stomach and intestines, typically resulting from bacterial toxins or viral infection and causing vomiting and diarrhea.

Gastroesophageal Reflux

gas-troh-eh-sof-ah-JEE-ul REE-fluks

/ˌɡæstroʊɪˌsɒfəˈdʒiːəl ˈriːflʌks/

A digestive disorder that occurs when acidic stomach juices, or food and fluids, back up from the stomach into the esophagus (GERD).

Gastrojejunostomy

gas-troh-jeh-joo-NOS-toh-mee

/ˌɡæstroʊˌdʒɛdʒʊˈnɒstəmi/

A surgical procedure that creates a connection between the stomach and the jejunum (middle part of the small intestine).

Gastroparesis

gas-troh-pah-REE-sis

/ˌɡæstroʊpəˈriːsɪs/

A condition that affects the stomach muscles and prevents proper stomach emptying.

Gastroschisis

gas-tros-KEE-sis

/ɡæˈstrɒskɪsɪs/

A birth defect in which the baby's intestines extend outside of the body through a hole next to the belly button.

Gastroscopy

gas-TROS-koh-pee

/ɡæˈstrɒskəpi/

An examination of the upper digestive tract (the esophagus, stomach, and duodenum) using a thin, flexible tube called a gastroscope.

Gastrulation

gas-troo-LAY-shun

/ˌɡæstrʊˈleɪʃən/

An early phase in the embryonic development during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.

Gaucher's disease

goh-SHAYZ dih-ZEEZ

/ɡoʊˈʃeɪz dɪˈziːz/

A genetic disorder resulting from the buildup of fatty substances in certain organs, especially the spleen and liver.

Gemellus

jeh-MEL-us

/dʒɛˈmɛləs/

Either of two small muscles (superior and inferior) located in the posterior hip region.

Gene

JEEN

/dʒiːn/

A unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

Gene Expression

JEEN ek-SPRESH-un

/dʒiːn ɪkˈsprɛʃən/

The process by which the information encoded in a gene is used to direct the assembly of a protein molecule.

Gene locus

JEEN LOH-kus

/dʒiːn ˈloʊkəs/

The specific physical location of a gene or other DNA sequence on a chromosome.

General anesthesia

JEN-er-al an-es-THEE-zhah

/ˈdʒɛnərəl ˌænəsˈθiːziə/

A medically induced coma with loss of protective reflexes, resulting from the administration of one or more general anesthetic agents.

Genetic Mapping

jeh-NET-ik MAP-ing

/dʒəˈnɛtɪk ˈmæpɪŋ/

The methods used to identify the locus of a gene and the distances between genes.

Genicular

jeh-NIK-yoo-lar

/dʒəˈnɪkjʊlər/

Relating to the knee joint.

Geniohyoid

jee-nee-oh-HY-oyd

/ˌdʒiːnioʊˈhaɪɔɪd/

A narrow muscle situated above the mylohyoid muscle that pulls the hyoid bone forward and upward.

Genital

JEN-ih-tul

/ˈdʒɛnɪtəl/

Relating to the human or animal reproductive organs.

Genome

JEE-nohm

/ˈdʒiːnoʊm/

The haploid set of chromosomes in a gamete or microorganism, or in each cell of a multicellular organism.

Genotype

JEE-noh-typ

/ˈdʒiːnəˌtaɪp/

The genetic constitution of an individual organism.

Genu

JEE-noo

/ˈdʒiːnuː/

The knee; or any anatomical structure shaped like a bent knee, such as the genu of the corpus callosum.

Genu Valgum

JEE-noo VAL-gum

/ˈdʒiːnuː ˈvælɡəm/

A condition in which the knees tilt inward while the ankles remain spaced apart; commonly called 'knock-knee'.

Genu Varum

JEE-noo VAIR-um

/ˈdʒiːnuː ˈvɛərəm/

A physical deformity marked by outward bowing of the lower leg in relation to the thigh; commonly called 'bow-leg'.

Genupectoral position

jen-yoo-PEK-tor-al poh-ZISH-un

/ˌdʒɛnjuːˈpɛktərəl pəˈzɪʃən/

The knee-chest position; a physical position where the patient rests on their knees and chest, used for certain rectal or pelvic exams.

Geriatrics

jer-ee-AT-riks

/ˌdʒɛriˈætrɪks/

The branch of medicine or social science dealing with the health and care of old people.

Germ Cell

JERM SEL

/dʒɜːrm sɛl/

A cell containing half the number of chromosomes of a somatic cell and able to unite with one from the opposite sex to form a new individual; a gamete.

Germ layer

JERM LAY-er

/dʒɜːrm ˈleɪər/

One of the three primary cell layers (ectoderm, mesoderm, endoderm) formed during early embryonic development.

Germicide

JER-mih-syd

/ˈdʒɜːrmɪˌsaɪd/

An agent that kills germs, especially pathogenic microorganisms.

Gerodontics

jer-oh-DON-tiks

/ˌdʒɛrəˈdɒntɪks/

The branch of dentistry dealing with the dental problems and care of older people.

Gestation

jes-TAY-shun

/dʒɛˈsteɪʃən/

The process or period of developing inside the womb between conception and birth.

Gestational diabetes

jes-TAY-shun-al dy-ah-BEE-teez

/dʒɛˈsteɪʃənəl ˌdaɪəˈbiːtiːz/

A condition in which a woman without diabetes develops high blood sugar levels during pregnancy.

Ghrelin

GREL-in

/ˈɡrɛlɪn/

A hormone produced in the stomach that stimulates appetite and signals the brain to eat.

Giant cell

JY-ant SEL

/ˈdʒaɪənt sɛl/

A very large cell, such as an osteoclast, or a mass formed by the fusion of several cells, often seen in chronic inflammation.

Giardiasis

jee-ar-DY-ah-sis

/ˌdʒiːɑːrˈdaɪəsɪs/

An infection in the small intestine caused by a microscopic parasite called Giardia lamblia.

Gigantism

jy-GAN-tizm

/dʒaɪˈɡæntɪzəm/

Abnormal growth due to an excess of growth hormone during childhood, before the bone growth plates have closed.

Gingiva

JIN-jih-vah

/ˈdʒɪndʒɪvə/

The gums; the tissue that surrounds the necks of teeth and covers the alveolar parts of the jaws.

Gingivectomy

jin-jih-VEK-toh-mee

/ˌdʒɪndʒɪˈvɛktəmi/

The surgical removal of gum tissue.

Gingivitis

jin-jih-VY-tis

/ˌdʒɪndʒɪˈvaɪtɪs/

Inflammation of the gums, or gingiva.

Ginglymus

JING-glih-mus

/ˈdʒɪŋɡlɪməs/

A hinge joint, such as the elbow or knee, which allows movement in only one plane.

Glabella

glah-BEL-ah

/ɡləˈbɛlə/

The smooth part of the forehead above and between the eyebrows.

Gland

GLAND

/ɡlænd/

An organ in the human or animal body which secretes particular chemical substances for use in the body or for discharge into the surroundings.

Glans Penis

GLANZ PEE-nis

/ɡlænz ˈpiːnɪs/

The sensitive bulbous structure at the distal end of the human penis.

Glasgow Coma Scale

GLAS-goh KOH-mah SKAYL

/ˈɡlæzɡoʊ ˈkoʊmə skeɪl/

A clinical scale used to reliably measure a person's level of consciousness after a brain injury (GCS).

Glaucoma

glaw-KOH-mah

/ɡlɔːˈkoʊmə/

A condition of increased pressure within the eyeball, causing gradual loss of sight.

Glaucoma, Angle-closure

glaw-KOH-mah ANG-gul KLOH-zhur

/ɡlɔːˈkoʊmə ˈæŋɡəl ˈkloʊʒər/

A medical emergency where the drainage angle of the eye becomes blocked, leading to a sudden rise in intraocular pressure.

Gleet

GLEET

/ɡliːt/

A thin, morbid discharge from a mucous membrane, especially from the urethra in chronic gonorrhea.

Glenoid Cavity

GLEE-noyd KAV-ih-tee

/ˈɡliːnɔɪd ˈkævɪti/

A shallow depression on a bone into which another bone fits to form a joint, especially that on the scapula into which the head of the humerus fits.

Glia

GLEE-ah

/ˈɡliːə/

The connective tissue of the nervous system, consisting of several different types of cells associated with neurons.

Glioblastoma

glee-oh-blas-TOH-mah

/ˌɡliːoʊblæˈstoʊmə/

A malignant tumor affecting the brain or spine.

Glioblastoma multiforme

glee-oh-blas-TOH-mah mul-tih-FOR-mee

/ˌɡliːoʊblæˈstoʊmə ˌmʌltɪˈfɔːrmi/

The most aggressive and common type of malignant primary brain tumor in humans.

Glioma

gly-OH-mah

/ɡlaɪˈoʊmə/

A type of tumor that starts in the glial cells of the brain or spine.

Gliosis

gly-OH-sis

/ɡlaɪˈoʊsɪs/

A nonspecific reactive change of glial cells in response to damage to the central nervous system, often resulting in a scar.

Glisson's capsule

GLIS-unz KAP-sool

/ˈɡlɪsənz ˈkæpsuːl/

A layer of connective tissue surrounding the liver and ensheathing the hepatic artery, portal vein, and bile ducts.

Globulin

GLOB-yoo-lin

/ˈɡlɒbjʊlɪn/

A group of proteins in blood plasma that are insoluble in pure water but soluble in dilute salt solutions; includes antibodies and transport proteins.

Glomerulonephritis

gloh-mer-yoo-loh-neh-FRY-tis

/ɡloʊˌmɛrjʊloʊnəˈfraɪtɪs/

Acute inflammation of the kidney, typically caused by an immune response.

Glomerulus

gloh-MER-yoo-lus

/ɡloʊˈmɛrjʊləs/

A cluster of nerve endings, spores, or small blood vessels, in particular a cluster of capillaries around the end of a kidney tubule.

Glomus tumor

GLOH-mus TOO-mur

/ˈɡloʊməs ˈtuːmər/

A rare, usually benign neoplasm arising from the glomus body, often found under the fingernails.

Glossitis

glos-EYE-tis

/ɡlɒˈsaɪtɪs/

Inflammation of the tongue.

Glossodynia

glos-oh-DIN-ee-ah

/ˌɡlɒsoʊˈdɪniə/

A chronic condition characterized by a burning sensation in the tongue with no apparent cause.

Glossopharyngeal nerve

glos-oh-fah-RIN-jee-al NERV

/ˌɡlɒsoʊfəˈrɪndʒiəl nɜːrv/

The ninth cranial nerve (CN IX), which supplies the tongue and pharynx, providing both sensory and motor functions.

Glottis

GLOT-is

/ˈɡlɒtɪs/

The part of the larynx consisting of the vocal cords and the slit-like opening between them.

Glottis, Edema of

GLOT-is eh-DEE-mah

/ˈɡɒtɪs ɪˈdiːmə/

Swelling of the laryngeal tissues, which can lead to life-threatening airway obstruction.

Glucagon

GLOO-kah-gon

/ˈɡluːkəˌɡɒn/

A hormone formed in the pancreas that promotes the breakdown of glycogen to glucose in the liver.

Glucagonoma

GLOO-kah-gon-OH-mah

/ˌɡluːkəɡəˈnoʊmə/

A rare tumor of the alpha cells of the pancreas that results in the overproduction of the hormone glucagon.

Glucocorticoid

gloo-koh-KOR-tih-koyd

/ˌɡluːkoʊˈkɔːrtɪkɔɪd/

Any of a group of corticosteroids (e.g., cortisol) that are involved in the metabolism of carbohydrates, proteins, and fats and have anti-inflammatory activity.

Glucokinase

gloo-koh-KY-nays

/ˌɡluːkoʊˈkaɪneɪs/

An enzyme that facilitates phosphorylation of glucose to glucose-6-phosphate, primarily in the liver and pancreas.

Glucometer

gloo-KOM-eh-ter

/ɡluːˈkɒmɪtər/

A medical device for determining the approximate concentration of glucose in the blood.

Gluconeogenesis

gloo-koh-nee-oh-JEN-eh-sis

/ˌɡluːkoʊˌniːoʊˈdʒɛnəsɪs/

The metabolic process by which organisms produce sugars (namely glucose) for catabolic reactions from non-carbohydrate precursors.

Glucose

GLOO-kohs

/ˈɡluːkoʊs/

A simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.

Glucose tolerance test

GLOO-kohs TOL-er-ans test

/ˈɡluːkoʊs ˈtɒlərəns tɛst/

A medical test in which glucose is given and blood samples taken afterward to determine how quickly it is cleared from the blood.

Glucosuria

gloo-koh-SOO-ree-ah

/ˌɡluːkoʊˈsjʊəriə/

The excretion of glucose into the urine; ordinarily, urine contains no glucose.

Gluteal

GLOO-tee-al

/ˈɡluːtiəl/

Relating to the gluteus muscles in the buttocks.

Gluteus Maximus

GLOO-tee-us MAK-sih-mus

/ˈɡluːtiəs ˈmæksɪməs/

The largest and outermost of the three gluteal muscles in each human buttock.

Gluteus Medius

GLOO-tee-us MEE-dee-us

/ˈɡluːtiəs ˈmiːdiəs/

One of the three gluteal muscles; it is situated on the outer surface of the pelvis and is crucial for hip abduction and stabilization.

Gluteus Minimus

/GLOO-tee-us MIN-ih-mus/

/ˈɡluːtiəs ˈmɪnɪməs/

The smallest of the three gluteal muscles, lying immediately beneath the gluteus medius.

Glycemic Index

gly-SEE-mik IN-deks

/ɡlaɪˈsiːmɪk ˈɪndɛks/

A system that ranks foods on a scale from 1 to 100 based on their effect on blood-sugar levels.

Glyceride

GLIS-er-yd

/ˈɡlɪsəˌraɪd/

A fatty acid ester of glycerol; the major components of animal and vegetable fats and oils.

Glyceride

GLIS-er-yd

/ˈɡlɪsəraɪd/

An ester formed from glycerol and fatty acids; the main constituent of body fat.

Glycerol

GLIS-er-ol

/ˈɡlɪsəˌrɒl/

A colorless, sweet, viscous liquid formed as a byproduct of soap manufacture; it is the backbone of triglycerides.

Glycocholic acid

gly-koh-KOH-lik AS-id

/ˌɡlaɪkoʊˌkoʊlɪk ˈæsɪd/

A bile acid that aids in the emulsification and digestion of fats.

Glycogen

GLY-koh-jen

/ˈɡlaɪkədʒən/

A substance deposited in bodily tissues as a store of carbohydrates; it is a polysaccharide which yields glucose on hydrolysis.

Glycogenesis

gly-koh-JEN-eh-sis

/ˌɡlaɪkoʊˈdʒɛnəsɪs/

The formation of glycogen from sugar.

Glycogenolysis

gly-koh-jen-OL-ih-sis

/ˌɡlaɪkədʒəˈnɒlɪsɪs/

The breakdown of glycogen to glucose-1-phosphate and glycogen.

Glycolysis

gly-KOL-ih-sis

/ɡlaɪˈkɒlɪsɪs/

The breakdown of glucose by enzymes, releasing energy and pyruvic acid.

Glycoprotein

gly-koh-PROH-teen

/ˌɡlaɪkoʊˈproʊtiːn/

Any of a class of proteins that have carbohydrate groups attached to the polypeptide chain.

Glycoside

GLY-koh-syd

/ˈɡlaɪkəˌsaɪd/

A compound formed from a simple sugar and another compound by replacement of a hydroxyl group in the sugar molecule.

Glycosuria

gly-koh-SOO-ree-ah

/ˌɡlaɪkoʊˈsjʊəriə/

The presence of reducing sugars in the urine, such as glucose.

Gnathic

NATH-ik

/ˈnæθɪk/

Of or relating to the jaw.

Goblet cell

GOB-let sel

/ˈɡɒblɪt sɛl/

A column-shaped cell found in the respiratory and intestinal tracts, which secretes the main component of mucus.

Goblet cell

GOB-let SEL

/ˈɡɒblɪt sɛl/

A glandular, modified simple columnar epithelial cell whose function is to secrete gel-forming mucins.

Goiter

GOY-ter

/ˈɡɔɪtər/

A swelling of the neck resulting from enlargement of the thyroid gland.

Goiter, Toxic

GOY-ter TOK-sik

/ˈɡɔɪtər ˈtɒksɪk/

An enlarged thyroid gland that is associated with hyperthyroidism (excessive thyroid hormone production).

Golgi apparatus

GOL-jee ap-ah-RAT-us

/ˈɡɒldʒi ˌæpəˈrætəs/

A complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.

Golgi tendon organ

GOL-jee TEN-dun OR-gan

/ˈɡɒldʒi ˈtɛndən ˈɔːrɡən/

A proprioceptive sensory receptor organ that senses changes in muscle tension.

Golgi tendon reflex

GOL-jee TEN-dun REE-fluks

/ˈɡɒldʒi ˈtɛndən ˈriːflɛks/

A protective feedback mechanism that causes muscle relaxation to prevent damage from excessive tension.

Gomphosis

gom-FOH-sis

/ɡɒmˈfoʊsɪs/

A type of fibrous joint that binds the teeth to bony sockets in the maxillary bone and mandible.

Gomphosis

gom-FOH-sis

/ɡɒmˈfoʊsɪs/

A specialized fibrous joint that anchors the root of a tooth into its bony socket.

Gonad

GOH-nad

/ˈɡoʊnæd/

An organ that produces gametes; a testis or ovary.

Gonadotropin

goh-nad-oh-TROH-pin

/ɡəˌnædəˈtroʊpɪn/

Any of a group of hormones secreted by the pituitary gland which stimulate the activity of the gonads.

Gonadotropin-releasing hormone

goh-nad-oh-TROH-pin ree-LEE-sing HOR-mohn

/ɡoʊˌnædəˈtroʊpɪn rɪˈliːsɪŋ ˈhɔːrmoʊn/

A hormone produced in the hypothalamus that stimulates the release of FSH and LH from the pituitary gland (GnRH).

Goniometry

goh-nee-OM-eh-tree

/ˌɡoʊniˈɒmɪtri/

The measurement of angles, specifically those of range of motion in joints.

Goniotomy

goh-nee-OT-oh-mee

/ˌɡoʊniˈɒtəmi/

A surgical procedure for treating congenital glaucoma by opening the drainage canals of the eye.

Gonococcus

gon-oh-KOK-us

/ˌɡɒnəˈkɒkəs/

A bacterium (Neisseria gonorrhoeae) that causes gonorrhea.

Gonorrhea

gon-oh-REE-ah

/ˌɡɒnəˈriːə/

A venereal disease involving inflammatory discharge from the urethra or vagina.

Gout

GOWT

/ɡaʊt/

A disease in which defective metabolism of uric acid causes arthritis, especially in the smaller bones of the feet.

Gouty tophus

GOW-tee TOH-fus

/ˈɡaʊti ˈtoʊfəs/

A deposit of uric acid crystals, in the form of monosodium urate, in people with high levels of uric acid in the blood (hyperuricemia).

Graafian follicle

GRAF-ee-un FOL-ih-kul

/ˈɡræfiən ˈfɒlɪkəl/

A fluid-filled structure in the mammalian ovary within which an ovum develops before ovulation.

Graafian follicle

GRAHF-ee-an FOL-ih-kul

/ˈɡræfiən ˈfɒlɪkəl/

A fluid-filled structure in the mammalian ovary within which an ovum develops before ovulation; also called a mature ovarian follicle.

Gracilis

GRAS-ih-lis

/ˈɡræsɪlɪs/

The most superficial muscle on the medial side of the thigh; it adduction the hip and flexes the knee.

Graft

GRAFT

/ɡræft/

A piece of living tissue that is transplanted surgically.

Graft-versus-host disease

GRAFT VER-sus HOHST dih-ZEEZ

/ɡræft ˈvɜːrsəs hoʊst dɪˈziːz/

A condition that occurs after a bone marrow or stem cell transplant in which the donated cells attack the recipient's body (GVHD).

Gram stain

GRAM STAYN

/ɡræm steɪn/

A method of staining used to differentiate bacterial species into two large groups (gram-positive and gram-negative).

Gram-negative

GRAM NEG-ah-tiv

/ɡræm ˈnɛɡətɪv/

Bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation; they typically have a thinner peptidoglycan layer.

Gram-positive

GRAM POZ-ih-tiv

/ɡræm ˈpɒzɪtɪv/

Bacteria that give a positive result in the Gram stain test by taking up the crystal violet stain; they have a thick peptidoglycan cell wall.

Grand mal

GRAN MAL

/ˌɡrænd ˈmæl/

A former term for a tonic-clonic seizure, characterized by loss of consciousness and violent muscle contractions.

Grand mal seizure

GRAN MAL SEE-zhur

/ˌɡrænd ˈmæl ˈsiːʒər/

A type of seizure that involves a loss of consciousness and violent muscle contractions; now more commonly termed a generalized tonic-clonic seizure.

Granular layer

GRAN-yoo-lar LAY-er

/ˈɡrænjʊlər ˈleɪər/

The stratum granulosum; a layer of the epidermis where keratinocytes begin to lose their nuclei and cytoplasm becomes granular.

Granular leucocyte

GRAN-yoo-lar LOO-koh-syt

/ˈɡrænjʊlər ˈluːkəˌsaɪt/

A white blood cell with secretory granules in its cytoplasm, e.g., an eosinophil or a basophil.

Granulation tissue

gran-yoo-LAY-shun TISH-oo

/ˌɡrænjʊˈleɪʃən ˈtɪʃuː/

New vascular tissue in granular form on an ulcer or the healing surface of a wound.

Granulocyte

GRAN-yoo-loh-syt

/ˈɡrænjʊləˌsaɪt/

A white blood cell with secretory granules in its cytoplasm, such as a neutrophil, basophil, or eosinophil.

Granulocytopenia

gran-yoo-loh-sy-toh-PEE-nee-ah

/ˌɡrænjʊloʊˌsaɪtəˈpiːniə/

A marked decrease in the number of granulocytes (neutrophils, eosinophils, and basophils) in the blood.

Granuloma

gran-yoo-LOH-mah

/ˌɡrænjʊˈloʊmə/

A mass of granulation tissue, typically produced in response to infection, inflammation, or the presence of a foreign substance.

Granulomatous

gran-yoo-LOH-mah-tus

/ˌɡrænjʊˈloʊmətəs/

Relating to or characterized by granulomas, which are small areas of inflammation.

Granulosa cells

gran-yoo-LOH-sah SELZ

/ˌɡrænjʊˈloʊsə sɛlz/

Somatic cells of the sex cord that are closely associated with the developing female gamete in the ovary.

Gravel

GRAV-el

/ˈɡrævəl/

Small calculous concretions in the kidneys or bladder.

Gravel, Urinary

GRAV-el YOOR-ih-nair-ee

/ˈɡrævəl ˈjʊərɪˌnɛri/

Small calculous concretions formed in the kidneys or bladder, which may be passed in the urine.

Graves' disease

GRAYVZ dih-ZEEZ

/ɡreɪvz dɪˈziːz/

A swelling of the thyroid gland (goiter) and protrusion of the eyeballs (exophthalmos), caused by an overactive thyroid.

Gravid

GRAV-id

/ˈɡrævɪd/

A medical term meaning pregnant; often used in clinical notes to indicate the number of times a woman has been pregnant (e.g., Gravida 2).

Gravidogram

GRAV-ih-doh-gram

/ˈɡrævɪdəˌɡræm/

A clinical chart used to monitor the progress of pregnancy, typically recording symphysis-fundal height.

Gravitational edema

grav-ih-TAY-shun-al eh-DEE-mah

/ˌɡrævɪˈteɪʃənəl ɪˈdiːmə/

Swelling caused by fluid accumulation in the lower limbs due to the effects of gravity, often seen in the ankles after long periods of standing.

Gray matter

GRAY MAT-er

/ɡreɪ ˈmætər/

The darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites.

Gray matter

GRAY MAT-er

/ɡreɪ ˈmætər/

The darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites.

Great vessels

GRAYT VES-elz

/ɡreɪt ˈvɛsəlz/

The large arteries and veins that bring blood to and from the heart, including the aorta, pulmonary trunk, and venae cavae.

Greenstick fracture

GREEN-stik FRAK-chur

/ˈɡriːnstɪk ˈfræktʃər/

An incomplete fracture in which one side of the bone is broken and the other side is bent; most common in children.

Greenstick fracture

GREEN-stik FRAK-chur

/ˈɡriːnstɪk ˈfræktʃər/

A fracture in a young, soft bone in which the bone bends and breaks, but does not completely separate.

Grisel's syndrome

grih-ZELZ SIN-drohm

/ɡriːˈzɛlz ˈsɪndroʊm/

Non-traumatic subluxation of the atlanto-axial joint caused by inflammation of adjacent soft tissues.

Grisolle's sign

gree-ZOLZ SYN

/ɡriːˈzoʊlz saɪn/

A diagnostic sign for smallpox: if the skin is stretched, a papule feels hard to the touch.

Groin

GROYN

/ɡrɔɪn/

The area of the body where the abdomen meets the upper thighs; the inguinal region.

Growth hormone

GROHTH HOR-mohn

/ɡroʊθ ˈhɔːrmoʊn/

A peptide hormone that stimulates growth, cell reproduction, and cell regeneration; also known as somatotropin.

Grumous

GROO-mus

/ˈɡruːməs/

Clotted or lumpy; often used to describe the appearance of certain pathological fluids or discharges.

Guaifenesin

gwy-FEN-eh-sin

/ˌɡwaɪˈfɛnəsɪn/

An expectorant drug used to help clear phlegm or mucus from the chest and throat.

Guanine

GWA-neen

/ˈɡwɑːniːn/

One of the four main nucleobases found in the nucleic acids DNA and RNA; it pairs with cytosine.

Guanosine

GWA-noh-seen

/ˈɡwɑːnəˌsiːn/

A purine nucleoside comprising guanine attached to a ribose sugar ring.

Gubernaculum

goo-ber-NAK-yoo-lum

/ˌɡuːbərˈnækjʊləm/

A fibrous cord that connects the fetal testis or ovary to the floor of the scrotum or labium majus, guiding its descent.

Gubernaculum

goo-ber-NAK-yoo-lum

/ˌɡuːbərˈnækjʊləm/

A fibrous cord that connects the fetal testis or ovary to the floor of the scrotum or labium majus, guiding its descent.

Guillain-Barré syndrome

GHEE-yan bah-RAY SIN-drohm

/ɡiːˈjæn bɑːˈreɪ ˈsɪndroʊm/

A rare neurological disorder in which the body's immune system mistakenly attacks part of its peripheral nervous system.

Guillain-Barré syndrome

GHEE-yan bah-RAY SIN-drohm

/ɡiːˈjæn bɑːˈreɪ ˈsɪndroʊm/

An acute, rapidly progressing inflammatory demyelinating polyneuropathy of the peripheral nerves.

Guinea worm

GHIN-ee wurm

/ˈɡɪni wɜːrm/

Dracunculus medinensis; a parasitic nematode that causes dracunculiasis.

Guinea worm disease

GHIN-ee wurm dih-ZEEZ

/ˈɡɪni wɜːrm dɪˈziːz/

A parasitic infection caused by the nematode Dracunculus medinensis, contracted by drinking contaminated water.

Gull's disease

GULZ dih-ZEEZ

/ɡʌlz dɪˈziːz/

An older name for adult-onset myxedema (hypothyroidism).

Gum

GUM

/ɡʌm/

Common term for the gingiva; the firm connective tissue surrounding the teeth.

Gum

GUM

/ɡʌm/

Common term for the gingiva; the fibrous tissue that covers the alveolar processes of the jaws.

Gumma

GUM-ah

/ˈɡʌmə/

A small, soft, noncancerous growth characteristic of the tertiary stage of syphilis.

Gumma

GUM-ah

/ˈɡʌmə/

A soft, noncancerous growth characteristic of the tertiary stage of syphilis.

Gustation

gus-TAY-shun

/ɡʌˈsteɪʃən/

The physical act or the sense of tasting.

Gustation

gus-TAY-shun

/ɡʌˈsteɪʃən/

The physical act or the sense of tasting.

Gustatory

GUS-tah-tor-ee

/ˈɡʌstəˌtɔːri/

Relating to the sense of taste.

Gustatory nerve

GUS-tah-tor-ee NERV

/ˈɡʌstəˌtɔːri nɜːrv/

Nerves that carry taste impulses from the tongue to the brain.

Gut

GUT

/ɡʌt/

The stomach or intestines; the alimentary canal or a portion of it.

Gut

GUT

/ɡʌt/

A general term for the stomach or intestines; the alimentary canal.

Guthrie test

GUTH-ree test

/ˈɡʌθri tɛst/

A screening test for phenylketonuria (PKU) performed on newborns using a drop of blood from a heel prick.

Guthrie test

GUTH-ree test

/ˈɡʌθri tɛst/

A diagnostic test used to screen for phenylketonuria (PKU) in newborn infants.

Guttate

GUT-ayt

/ˈɡʌteɪt/

Having the shape of a drop; often used to describe certain types of psoriasis lesions.

Gynecology

gy-neh-KOL-oh-jee

/ˌɡaɪnɪˈkɒlədʒi/

The branch of physiology and medicine which deals with the functions and diseases specific to women and girls, especially those affecting the reproductive system.

Gynecomastia

guy-neh-koh-MAS-tee-ah

/ˌɡaɪnɪkoʊˈmæstiə/

Enlargement of a man's breasts, usually due to hormone imbalance or hormone therapy.

Gynoplasty

GY-noh-plas-tee

/ˈɡaɪnəˌplæsti/

Plastic or restorative surgery of the female reproductive organs.

Gyrus

JY-rus

/ˈdʒaɪrəs/

A ridge or fold between two clefts on the cerebral surface in the brain.

Gyrus

JY-rus

/ˈdʒaɪrəs/

A ridge or fold on the cerebral cortex of the brain (plural: gyri).

Gyrus, Angular

ANG-gyoo-lar JY-rus

/ˈæŋɡjʊlər ˈdʒaɪrəs/

A region of the brain in the parietal lobe that is involved in language, number processing, and spatial cognition.

Gyrus, Cingulate

SIN-gyoo-layt JY-rus

/ˈsɪŋɡjʊlɪt ˈdʒaɪrəs/

A gyrus situated just above the corpus callosum, involved with sensory input and emotion.

Gyrus, Postcentral

pohst-SEN-trul JY-rus

/poʊstˈsɛntrəl ˈdʒaɪrəs/

The primary somatosensory cortex; a prominent structure in the parietal lobe of the human brain.

Gyrus, Precentral

pree-SEN-trul JY-rus

/priːˈsɛntrəl ˈdʒaɪrəs/

The primary motor cortex; a structure in the posterior frontal lobe.

Gyrus, Superior Temporal

soo-PEER-ee-or TEM-por-al JY-rus

/suːˈpɪəriər ˈtɛmpərəl ˈdʒaɪrəs/

The gyrus containing the primary auditory cortex, responsible for processing sounds.

Gyrus, Supramarginal

soo-prah-MAR-jih-nul JY-rus

/ˌsuːprəˈmɑːrdʒɪnəl ˈdʒaɪrəs/

A portion of the parietal lobe involved in language perception and processing.