/ Dictionary / Index P polysulfide: Meaning and Definition of Find definitions for: pol•y•sul•fide Pronunciation: (pol"ē-sul'fīd), [key] — n. Chem. a sulfide whose molecules contain two or more atoms of sulfur. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polystyrene polysuspensoid 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