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rhythm, biological

(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...

oxpecker

(Encyclopedia)oxpecker, common name for an African starling of the genus Buphagus. Also known as tickbirds, oxpeckers have very short legs and sharp claws, which aid them in perching on the backs of large mammals, ...

nitric oxide

(Encyclopedia)nitric oxide or nitrogen monoxide, a colorless gas formed by the combustion of nitrogen and oxygen as given by the reaction: energy + N2 + O2 → 2NO; m.p. −163.6℃; b.p. −151.8℃. Nitric oxide ...

Beauvoir, Simone de

(Encyclopedia)Beauvoir, Simone de sēmônˈ də bōvwärˈ [key], 1908–86, French author. A leading exponent of existentialism, she is closely associated with Jean-Paul Sartre, with whom she had a life-long relat...

Capote, Truman

(Encyclopedia)Capote, Truman käpōˈtē [key], 1924–84, American author, b. New Orleans as Truman Streckfus Persons. During his lifetime, the witty, diminutive writer was a well-known public personage, hobnobbin...

Blackfoot

(Encyclopedia)Blackfoot, Native North Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). They occupied in the early 19th cent. a large range of territory...

Black Hawk War

(Encyclopedia)Black Hawk War, conflict between the Sac and Fox and the United States in 1832. After the War of 1812, whites settling the Illinois country exerted pressure on the Native Americans. A treaty of 1804, ...

mosquito

(Encyclopedia)mosquito məskēˈtō [key], small, long-legged insect of the order Diptera, the true flies. The females of most species have piercing and sucking mouth parts and apparently they must feed at least on...

fats and oils

(Encyclopedia)fats and oils, group of organic substances that form an important part of the diet and also are useful in many industries. The fats are usually solid, the oils generally liquid at ordinary room temper...

cancer, in medicine

(Encyclopedia)cancer, in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth. Unlike benign tumors, mali...