/ Dictionary / Index P pronghorn: Meaning and Definition of Find definitions for: prong•horn Pronunciation: (prông'hôrn", prong'-), [key] — pl. -horns, -horn. a fleet, antelopelike ruminant, Antilocapra americana, of the plains of western North America: now greatly reduced in number and endangered in some areas. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pronghorn (Thesaurus) pronged pronominal Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language