/ Dictionary / Index P poaceous: Meaning and Definition of Find definitions for: po•a•ceous Pronunciation: (pō-ā'shus), [key] — adj. belonging to the Poaceae, an alternate name for the plant family Gramineae. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. POA poach Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language