/ Dictionary / Index P polyvinyl formal: Meaning and Definition of Find definitions for: pol'yvi'nyl for'mal Pronunciation: (fôr'mal), [key] — Chem. Chem. a colorless, water-insoluble, polyvinyl acetal produced from partially hydrolyzed polyvinyl acetate and formaldehyde, used chiefly in the manufacture of lacquers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polyvinyl chloride polyvinylidene Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language