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sperm

(Encyclopedia)sperm or spermatozoon spûrˌmətəzōˈən, –zōˈŏn [key], in biology, the male gamete (sex cell), corresponding to the female ovum in organisms that reproduce sexually. In higher animals the spe...

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

Paraguay, river, Brazil and Paraguay

(Encyclopedia)Paraguay, river, c.1,300 mi (2,090 km) long, rising in the highlands of central Mato Grosso state, Brazil. Flowing generally southward, it forms the border between Brazil and Paraguay in the pantanal,...

Carlos, Spanish and Portuguese kings

(Encyclopedia)Carlos. For Spanish and Portuguese kings thus named, use Charles.

Forster, William Edward

(Encyclopedia)Forster, William Edward, 1818–86, British statesman. He entered Parliament as a Liberal in 1861. As vice president of the council in William Gladstone's first ministry (1868–74), he introduced the...

rust, in chemistry and metallurgy

(Encyclopedia)rust, in chemistry and metallurgy: see corrosion. ...

mace, in botany and cooking

(Encyclopedia)mace, in botany and cooking: see nutmeg. ...

American Ephemeris and Nautical Almanac

(Encyclopedia)American Ephemeris and Nautical Almanac: see ephemeris. ...

Catawba, river, N.C. and S.C.

(Encyclopedia)Catawba, river, N.C. and S.C.: see Wateree. ...