/ Dictionary / Index P polyvinyl butyral: Meaning and Definition of Find definitions for: pol'yvi'nyl bu'tyral Pronunciation: [key] — Chem. Chem. a white, water-insoluble, polyvinyl acetal made with butyraldehyde, used chiefly as an interlayer in the manufacture of safety glass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polyvinyl alcohol polyvinyl chloride 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