Chemistry. the univalent group BiO + , occurring in certain bismuth salts, as bismuth oxychloride, BiOCl.
a mineral, bismuth carbonate, resulting from the alteration of bismuth minerals: a minor source of bismuth.
any of several thorny cactuses of the genera Echinocactus, Ferocactus, and Astrophytum of the southwestern U.S. Historical Examples Dust of the Desert Robert Welles Ritchie The Book of the National Parks Robert Sterling Yard The Mystic Mid-Region Arthur J. Burdick
Also called American bison, American buffalo. a North American, oxlike ruminant, Bison bison, having a large head and high, humped shoulders: formerly common in North America, its small remaining population in isolated western areas of the U.S. and Canada is now protected. Also called wisent. a related animal, Bison bonasus, of Europe, less shaggy and […]
a tetrahedral form, each edge of which is bisected by the perpendicular bisecting the edge that does not intersect it.