Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «W»:
Wheat weevil: See: Granary weevil....
Wheezer: A slang term for a patient who is wheezing. Sometimes applied to someone having serious trouble breathing....
Wheezing: A whistling noise in the chest during breathing when the airways are narrowed or compressed....
WHI: The Women's Health Initiative, a long-term health study sponsored by the National Institutes of Health (NIH) focused on strategies for preventing heart disease, breast cancer, colorectal cancer and osteoporosis in postmenopausal women....
Whiplash injury: Hyperextension (over-extension) injury to the neck, often the result of being struck from behind, as by a fast-moving vehicle in a car accident. The mechanics of whiplash injury are thought to be as follows: The victim may be first pushed or accelerated forward, pushing the body for...
Whipple disease: A form of intestinal malabsorption (an inability to absorb nutrients from the intestine) described in 1907 by the pathologist and Nobel laureate George H. Whipple in a medical missionary who first developed arthritis and then weight loss, cough, fever, diarrhea, hypotension (low blo...
Whipple procedure: A type of surgery used to treat pancreatic cancer. The head of the pancreas, the duodenum, a portion of the stomach, and other nearby tissues are removed.
The Whipple procedure is named for Allen O. Whipple, an American surgeon, 1881-1963 (not George Whipple, the Nobel Prize-winni...
Whipworm: A nematode (roundworm) also called Trichuris trichiura. The third most common round worm of humans.
The worm is found worldwide, with infections more frequent in areas with tropical weather and poor sanitation practices and among children. It is estimated that 800 million people are infe...
White blood cell
White blood cell: One of the cells the body makes to help fight infections. There are several types of white blood cells (leukocytes). The two most common types are the lymphocytes and neutrophils (also called polymorphonuclear leukocytes, PMNs, or "polys").
Lymphocytes are made in lymphoid tissu...
White blood cell count
White blood cell count
(leukocyte count): The number of white blood cells (WBCs) in the blood. The
WBC is usually measured as part of the CBC
(complete blood count). White blood cells are the infection-fighting cells in
the blood and are distinct from the red (oxygen-carrying) blood cells known ...
White cell differential, automated
White cell differential, automated: A
machine-generated percentage of the different types of white blood cells, usually split into granulocytes, lymphocytes, monocytes, eosinophils, and basophils....
White coat hypertension
White coat hypertension: A transient increase in blood pressure (hypertension) triggered by the sight of medical personnel in white coats (or other attire)....
White matter: The part of the brain that contains myelinated nerve
fibers. The white matter is white because it is the color of myelin, the insulation
covering the nerve fibers. The white matter is as opposed to the gray matter (the cortex
of the brain which contains nerve cell bodies)....
White phosphorus: A waxy
solid which burns easily and is used in chemical manufacturing and smoke
munitions. It is also used by industry to produce phosphoric acid and other
chemicals for use in fertilizers, food additives, and cleaning compounds. Small amounts of white phosphorus were used in th...
White spots on the nails
White spots on the nails: Very small semi-circular white spots on the nails. These spots may be found on the fingernails and, particularly, the toenails. The white spots on the nails reflect injury to the base (matrix) of the nail. The matrix is the part under the visible nail where the nail cells ...