/ Dictionary / Index P poison haw: Meaning and Definition of Find definitions for: poi'son haw' Pronunciation: [key] a shrub, Viburnum molle, of the central U.S., having white flowers and bluish-black fruit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. poison gas poison hemlock Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language