/ Dictionary / Index O ornitho-: Meaning and Definition of Find definitions for: ornitho- Pronunciation: [key] a combining form meaning “bird,” used in the formation of compound words: ornithology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ornithischian ornithoid Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language