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Mackenzie, William Lyon

(Encyclopedia)Mackenzie, William Lyon, 1795–1861, Canadian journalist and insurgent leader, b. Scotland; grandfather of William Lyon Mackenzie King. Emigrating to Upper Canada in 1820, he published (1824–34), f...

mammary gland

(Encyclopedia)mammary gland, organ of the female mammal that produces and secretes milk for the nourishment of the young. A mammal may have from 1 to 11 pairs of mammary glands, depending on the species. Generally,...

harmonica

(Encyclopedia)harmonica. 1 The simplest of the musical instruments employing free reeds, known also as the mouth organ or French harp. It was probably invented in 1829 by Friedrich Buschmann of Berlin, who called h...

Ecevit, Bülent

(Encyclopedia)Ecevit, Bülent bülĕntˈ ĕjĕvĭtˈ [key], 1925–2006, Turkish political leader and journalist. An editor for Ulus, the organ of the Republican People's party, he was elected to parliament (1957�...

Copland, Aaron

(Encyclopedia)Copland, Aaron kōpˈlənd [key], 1900–1990, American composer, b. Brooklyn, N.Y. Copland was a pupil of Rubin Goldmark and of Nadia Boulanger, who introduced his work to the United States when she ...

fetus

(Encyclopedia)fetus, term used to describe the unborn offspring in the uterus of vertebrate animals after the embryonic stage (see embryo). In humans, the fetal stage begins seven to eight weeks after fertilization...

tuatara

(Encyclopedia)tuatara –tāˈrə [key], lizardlike reptile, Sphenodon punctatus, last survivor of the reptilian order Rhynchocephalia, which flourished in the early Mesozoic era before the rise of the dinosaurs. A...

radioactive isotope

(Encyclopedia)radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reache...

bone marrow

(Encyclopedia)bone marrow, soft tissue filling the spongy interiors of animal bones. Red marrow is the principal organ that forms blood cells in mammals, including humans (see blood). In children, the bones contain...

Luxemburg, Rosa

(Encyclopedia)Luxemburg, Rosa rōˈzä lo͝okˈsəmbo͝ork [key], 1871–1919, German revolutionary, b. Russian Poland. Her revolutionary activities forced her to flee to Switzerland in 1889, where she became a Mar...