/ Dictionary / Index A avian: Meaning and Definition of Find definitions for: a•vi•an Pronunciation: (ā'vē-un), [key] — adj. of or pertaining to birds. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: avian (Thesaurus) avi- avian diphtheria Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language