Columbia Encyclopedia

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sandstone

(Encyclopedia)sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone va...

alpaca

(Encyclopedia)alpaca ălpăkˈə [key], partially domesticated South American mammal, Lama pacos, of the camel family. Genetic studies show that it is a descendant of the vicuña. Although the flesh is sometimes us...

alabaster

(Encyclopedia)alabaster, fine-grained, massive, translucent variety of gypsum, a hydrous calcium sulfate. It is pure white or streaked with reddish brown. Alabaster, like all other forms of gypsum, forms by the eva...

Hopkins, Stephen

(Encyclopedia)Hopkins, Stephen, 1707–85, colonial governor of Rhode Island and political leader in the American Revolution, b. Providence, R.I. A member of the colonial assembly for many years, he also served as ...

hippopotamus

(Encyclopedia)hippopotamus, herbivorous, river-living mammal of tropical Africa. The large hippopotamus, Hippopotamus amphibius, has a short-legged, broad body with a tough gray or brown hide. The male stands about...

Holbrooke, Richard Charles

(Encyclopedia)Holbrooke, Richard Charles hōlˈbro͝ok [key], 1941–2010, American diplomat, b. New York City, grad. Brown (B.A., 1962). Holbrooke joined the foreign service, worked on Vietnamese affairs for six y...

guanaco

(Encyclopedia)guanaco hwänˈäko [key], wild mammal of the camel family, Lama guanicoe, found on arid plains in the Andes Mts. It is about 31⁄2 ft (105 cm) high at the shoulder, with a long neck; it is brown on ...

gaur, in zoology

(Encyclopedia)gaur, large wild ox of Southeast Asia, having a humplike ridge on the back. The gaur, Bos gaurus, is thought to be the largest of the wild cattle; the bulls may measure more than 6 ft (1.8 m) at the s...

frogmouth

(Encyclopedia)frogmouth, common name for small, owllike birds of the family Podargidae, ranging in size from 9 to 21 in. (22.5–52.5 cm). Their soft plumage is a mottled gray-brown in color with little distinction...

American Civil Liberties Union

(Encyclopedia)American Civil Liberties Union (ACLU), nonpartisan organization devoted to the preservation and extension of the basic rights set forth in the U.S. Constitution. Founded (1920) by such prominent figur...