/ Dictionary / Index B bighorn: Meaning and Definition of Find definitions for: big•horn Pronunciation: (big'hôrn"), [key] — pl. -horns, -horn. a wild sheep, Ovis canadensis, of the Rocky Mountains, with large, curving horns. Also called Big•horn Pronunciation: (big'hôrn"), [key] — n. a river flowing from central Wyoming to the Yellowstone River in S Montana. 336 mi. (540 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bighorn (Thesaurus) big hook Bighorn Mountains Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language