Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «N»:
Niacin: Nicotinic acid, one of the B-complex
B vitamins. Deficiency of niacin in the diet results in the disease pellagra. See: Pellagra....
Niacin deficiency: See: Pellagra....
Niacin for high cholesterol
Niacin for high cholesterol: Niacin or nicotinic
acid, one of the water-soluble B
vitamins, given to lower cholesterol. Nicotinic acid lowers the total cholesterol,
"bad" LDL-cholesterol, and triglyceride levels, while raising the
"good" HDL-cholesterol level.
There are two types of nicotinic a...
NIAID (Nat'l Inst of Allergy and Infectious Dis.)
NIAID (National Institute of Allergy and Infectious
Diseases): One of the U.S. National Institutes of Health (NIH),
the mission of the NIAID is "to support and conduct research and
research training (that) strives to understand, treat, and ultimately
prevent the myriad infectious, immunologic,...
NIAMS: Stands for National
Institute of Arthritis and Musculoskeletal and Skin
Diseases, one of the National Institutes of Health in the
U.S. NIAMS's mission is "conduct and support a broad
spectrum of research on normal structure and function of
bones, muscles, and skin, as well as the numero...
NICHD: The National Institute of Child Health and Human Development, one of the US National Institutes of Health. NICHD is in a sense the NIH for kids in that it is concerned with
The mission of the NICHD is, in formal terms, to support and conduct "research on fertility, pregnancy...
Nickel: A silver-white metallic element. Long-term exposure to nickel, such as from jewelry, can cause a form of contact dermatitis called nickel dermatitis.
Exposure to nickel fumes can cause nasal cancer and lung cancer....
Nicotiana tabacum: A South American herb whose leaves contain 2-8% nicotine and serve as the source of smoking and smokeless tobacco and the basis of huge health problems.
Nicotiana tabacum belongs to the nightshade family, which also includes potatoes, tomatoes, eggplant and red peppers. All contai...
Nicotine: An alkaloid (a nitrogen-containing chemical) made by the tobacco plant or produced synthetically. In the plant kingdom, nicotine is not restricted to tobacco but is widespread. The tobacco plant, Nicotiana tabacum, belongs to the nightshade family, which also includes potatoes, tomatoes, e...
Nicotinic acid: Deficiency of nicotinic acid (also known as niacin), one of the B-complex vitamins, causes pellagra.
Pellagra was known as the "disease of the four D's" -- dermatitis,
diarrhea, dementia and death. The disease is specifically
Dermatitis: A rash on areas of the s...
Nictitate: To wink. Nictitating spasm is spasm of the eyelid with continuous winking.
"Nictitate" and the older verb "nictate" both come from the Latin word for winking, "nictare."...
Nictitating spasm: Spasm of the eyelid with continuous winking.
To nictitiate is to wink. "Nictitate" and the older verb "nictate" both come from the Latin word for winking, "nictare."...
NICU: Newborn, or Neonatal, Intensive Care Unit, an intensive care unit designed for premature and ill newborn babies. Less often, NICU may refer to a Neurologic Intensive Care Unit....
NIDA: Stands for the National
Institute on Drug Abuse, one of the National Institutes of
Health in the U.S., whose mission is to "lead the nation in
bringing the power of science to bear on drug abuse and
addiction through support and conduct of research across a
broad range of disciplines an...
NIDCD: Stands for National
Institute on Deafness and Other Communication Disorders,
one of the US National Institutes of Health (the NIH).
The mission of the National Institute on Deafness and Other Communication Disorders is to "conduct and support biomedical research and research training on no...