/ Dictionary / Index O ornis: Meaning and Definition of Find definitions for: or•nis Pronunciation: (ôr'nis), [key] — pl. or•ni•thes an avifauna. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ornery ornith- Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language