Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «G»:
Granulomatous colitis: Crohn's disease of the colon
(the large intestine).
Crohn's disease is a chronic inflammatory disorder,
primarily involving the small and large intestine, but which can
affect other parts of the digestive system as well. It is named for
the doctor who first described the ...
Grapefruit diet: The Grapefruit diet is a weight loss plan that incorporates eating half a grapefruit with each meal and following a severely restrictive low-calorie diet. Like many other "fad" diets, rumors have circulated that this diet is associated with a major medical center, but this is untrue...
Graves' disease: Generalized diffuse overactivity ("toxicity") of the
entire thyroid gland which becomes enlarged into a goiter. Graves' disease is the
most common cause of hyperthyroidism.
There are three components to Graves' disease:
Hyperthyroidism (the presence of too much thyroid hormone...
Gray: A unit of absorbed radiation equal to the dose of one joule of energy absorbed per kilogram of matter, or 100 rad. The unit is named for the British physician L. Harold Gray (1905-1965), an authority on the use of radiation in the treatment of cancer. The abbreviation for a gray is Gy. See als...
Gray baby syndrome
Gray baby syndrome: A syndrome due to toxicity of the antibiotic chloramphenicol in the newborn, especially the premature newborn, because of lack the necessary liver enzymes to metabolize this drug.
Chloramphenicol accumulates in the baby, causing hypotension (low blood pressure), cyanosis (blue c...
Gray matter: The cortex of the brain which contains nerve cell bodies.
The gray matter is in contrast to the white matter, the part of the brain that contains
myelinated nerve fibers. The gray matter is so named because it in fact appears gray. The
white matter is white because that is the color of ...
Gray syndrome: See: Gray baby syndrome....
Gray's Anatomy: A book entitled "Anatomy Descriptive and Surgical" by Henry Gray appeared in 1858. Little could Dr. Gray have suspected that his textbook of human anatomy would still be in print today and be perhaps the best known of all medical books.
The English anatomist Henry Gray was born in 18...
Great Plague: The "Great Plague" that
swept London in 1665 was probably not really the plague but rather
The plague was a highly contagious, infectious, virulent,
devastating disease due to a bacteria called Yersinia pestis which
mainly infects rats and other rodents that serv...
Great pox: Syphilis. An old name to distinguish it from the smallpox....
Great saphenous vein
Great saphenous vein: The larger of the two saphenous veins, the principal veins that run up the leg superficially (near the surface).
The great saphenous vein goes from the foot all the way up to the saphenous opening, an oval aperture in the broad fascia of the thigh, a fibrous membrane through...
Greek medicine: Medicine in Greece and the Greek world. The foundations of much of modern Western medicine lie in classical Greece, from about 800 B.C.E. to about 200 C.E. During this period, Greek medicine departed from the divine and mystical and moved toward observation and logical reasoning. The...
Green fluorescent protein
Green fluorescent protein: Abbreviated GFP. A protein that glows green under fluorescent light. Found naturally in the jellyfish Aequorea victoria, GFP fluoresces green when exposed to blue light. It has a sequence of three amino acids (serine-tyrosine-glycine) which is responsible for its fluoresce...
Greenstick fracture: A fracture in which one side of a bone is broken while the other is bent (like a green stick).