/ Dictionary / Index A antiar: Meaning and Definition of Find definitions for: an•ti•ar Pronunciation: (an'tē-är"), [key] — n. the upas tree. an arrow poison prepared from the sap of the upas tree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. antianxiety drug antiarrhythmic Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language