/ Dictionary / Index P polyfoam: Meaning and Definition of Find definitions for: pol•y•foam Pronunciation: (pol'ē-fōm"), [key] — n. a rigid, semirigid, or rubbery foam composed of minute bubbles of air or carbon dioxide embedded in a polymer matrix, often polyurethane: used in mattresses, padding, insulation, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polyfoam (Thesaurus) polyethylene glycol polyfunctional Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language