Dictionary of Medical Terms

Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.

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All terms that start with the letter G

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galactorrhea

Excessive production of breast milk.
galactosemia

A disease present at birth caused by a genetic lack of an enzyme needed to metabolize galactose into glucose. May…
gall

The bile produced in the liver and stored in the gallbladder.
gallbladder

The storage sac for bile, located below the liver.
gallstone

A stone-like mass that forms in the gallbladder.
gamma globulin

Blood protein that contains most antibodies. Used in the temporary prevention of hepatitis and as treatment for disorders with antibody…
ganglion cyst

A benign, knot-like, cystic tumor on a tendon sheath.
gangrene

The decay of body tissue in a part of the body where the blood supply is obstructed by injury or…
gastric

Having to do with the stomach.
gastritis

Inflammation of the stomach lining.
gastroenteritis

Inflammation of the stomach and the intestines, usually producing symptoms of nausea, vomiting and diarrhea.
gastrointestinal

Having to do with the stomach and intestines.
gene

A unit of heredity located on a chromosome.
generic

1. General; typical; not specific. 2. Medicine that’s not a name brand.
genetic

Hereditary. Having to do with the genes.
genitalia

The reproductive organs.
genitourinary system

The genitals and urinary organs.
geriatrics

The branch of medicine devoted to the elderly.
germ

A disease-causing microorganism.
German measles

A mild childhood disease that causes fever and rash. Although rubella is mild in childhood, it’s dangerous to pregnant women…
gestation

The period of development within the uterus from conception to birth.