/ Dictionary / Index R rhinoceros: Meaning and Definition of Find definitions for: rhi•noc•er•os Pronunciation: (rī-nos'ur-us), [key] — pl. -os•es, -os. any of several large, thick-skinned, perissodactyl mammals of the family Rhinocerotidae, of Africa and India, having one or two upright horns on the snout: all rhinoceroses are endangered. unicorn (def. 4). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rhinoceros (Thesaurus) rhino rhinoceros beetle Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language