Dictionary

Enter a word or phrase below to search our online dictionary of over 1,300 general medical terms, or click on a letter of the alphabet to view all terms beginning with that letter:

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Search for 'G'

Phrase Definition
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 result in mental retardation, cataracts and liver damage.
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 deficiencies.
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 disease.
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 See rubella.
gestation The period of development within the uterus from conception to birth.
giantism Abnormal growth of the body due to an excessive amount of growth hormone produced by the pituitary gland.
giardiasis A diarrheal illness caused by infection with Giardia lamblia, a parasitic protozoan.
gingiva The gums.
gingivitis Inflammation of the gums.
gland An organ that releases a chemical. Endocrine glands are ductless and secrete hormones directly into the bloodstream. Exocrine glands secrete externally, either through a tube or duct.
glaucoma An eye disease, characterized by increased pressure within the eye, that can result in blindness if not treated.
glomerulonephritis When the filtering units in the kidneys, called the glomeruli, are damaged, the kidneys don't function properly and waste and extra fluids build up in the body.
glossitis Inflammation of the tongue.
glucose Dextrose. A simple six-carbon sugar naturally found in fruits, honey and blood.
goiter Enlargement of the thyroid gland.
gonad A sex gland (ovary or testis).
gonorrhea A highly contagious, sexually transmitted bacterial disease of the genital/urinary system.
gout A form of arthritis caused by deposits of uric acid crystals in the joints, usually the feet, hands and, especially, the big toe.
graft A piece of skin or other tissue used as a transplant.
Gram's stain A stain used as the first step in identifying bacteria.
grand mal A major epileptic seizure characterized by convulsions, unconsciousness and sometimes loss of urinary or bowel continence. Usually followed by a brief period of lethargy and disorientation.
Graves' disease Overactive thyroid gland function (hyperthyroidism). Sometimes associated with protrusion of the eyes.
groin The region of the body where the thigh and lower abdomen meet.
Guillain-Barre syndrome A rare but reversible reaction to a viral illness or immunization that causes partial to complete loss of movement of certain muscles, weakness, numbness and tingling. In the severe form, a person may need intensive care and breathing support.
gynecology The branch of medicine that deals with the study and treatment of reproductive diseases in women.
gynecomastia Overdevelopment of male breast tissue. Usually benign and temporary.