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aphid

(Encyclopedia)aphid or plant louse, tiny, usually green, soft-bodied, pear-shaped insect injurious to vegetation. It is also called greenfly and blight. Aphids are mostly under 1⁄4 in. (6 mm) long. Some are wingl...

menstruation

(Encyclopedia)menstruation, periodic flow of blood and cells from the lining of the uterus in humans and most other primates, occurring about every 28 days in women. Menstruation commences at puberty (usually betwe...

hertz

(Encyclopedia)hertz hûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz...

Nevin, Ethelbert Woodbridge

(Encyclopedia)Nevin, Ethelbert Woodbridge, 1862–1901, American pianist and composer, b. Edgeworth, Pa., studied in Boston and in Germany. He made his debut as a pianist in Pittsburgh in 1886 but devoted most of h...

Snodgrass, W. D.

(Encyclopedia)Snodgrass, W. D. (William DeWitt Snodgrass), 1926–2009, American poet and translator, b. Wilkinsburg, Pa., grad. Univ. of Iowa, 1959. He is particularly known for his debut book, Heart's Needle (195...

Stirling engine

(Encyclopedia)Stirling engine, an external combustion reciprocating engine having an enclosed working fluid that is alternately compressed and expanded to operate a piston, thus converting heat from a variety of so...

Boccaccino, Boccaccio

(Encyclopedia)Boccaccino, Boccaccio bōk-kätˈchō bōk-kätchēˈnō [key], c.1465–1525. Italian artist, b. Cremona. He probably made several trips to Venice, for his numerous paintings of the half-length Madon...

Schnitzler, Arthur

(Encyclopedia)Schnitzler, Arthur ärˈto͝or shnĭtsˈlər [key], 1862–1931, Austrian dramatist and novelist. The son of a prominent Jewish Viennese physician, he studied and practiced medicine until he attracted...

sunspots

(Encyclopedia)sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surro...

Rego, José Lins do

(Encyclopedia)Rego, José Lins do zho͝ozĕˈ lēnz dô rĕˈgo͝o [key], 1901–57, Brazilian novelist. His fame rests largely on his semiautobiographical “sugarcane cycle,” dealing with social transformation ...