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