Columbia Encyclopedia

Search results

500 results found

fractal geometry

(Encyclopedia)fractal geometry, branch of mathematics concerned with irregular patterns made of parts that are in some way similar to the whole, e.g., twigs and tree branches, a property called self-similarity or s...

ivory-billed woodpecker

(Encyclopedia)ivory-billed woodpecker, common name for the largest of the North American woodpeckers, Campephilus principalis. Once plentiful in Southern hardwood forests, it was believed to be extinct or nearing e...

heron

(Encyclopedia)heron hĕrˈən [key], common name for members of the family Ardeidae, large wading birds including the bittern and the egret, found in most temperate regions but most numerous in tropical and subtrop...

Andersen, Hans Christian

(Encyclopedia)Andersen, Hans Christian, 1805–75, Danish poet, novelist, and writer of fairy tales. Born to an illiterate washerwoman and reared in poverty, he left Odense at 14 for Copenhagen, where he lived with...

grapefruit

(Encyclopedia)grapefruit, pomelo pumˈməlō [key], citrus fruit (Citrus paradisi) of the family Rutaceae (orange family). The grapefruit is so named because it grows in grapelike bunches. The large globular fruit...

mica

(Encyclopedia)mica mīˈkə [key], general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium, ferrous iron, ferric iron, sodium, and lithium and more rarely...

National Forest System

(Encyclopedia)National Forest System, federally owned reserves, c.191 million acres (77.4 million hectares), administered by the Forest Service of the U.S. Dept. of Agriculture. The system is made up of 155 nationa...

Kunitz, Stanley Jasspon

(Encyclopedia)Kunitz, Stanley Jasspon kyo͞oˈnĭts [key], 1905–2006, American poet, teacher, and editor, b. Worcester, Mass. He graduated from Harvard (B.A., 1926; M.A., 1927), worked as a journalist and editor,...

yucca

(Encyclopedia)yucca yŭkˈə [key], any plant of the genus Yucca, stiff-leaved stemless or treelike succulents of the family Liliaceae (lily family), native chiefly to the tablelands of Mexico and the American Sout...