/ Dictionary / Index O ornithosis: Meaning and Definition of Find definitions for: or•ni•tho•sis Pronunciation: (ôr"nu-thō'sis), [key] — n. Vet. Pathol. psittacosis, esp. of birds other than those of the parrot family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ornithosis (Thesaurus) ornithorhynchus oro* Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language