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Meaning of polyvinyl butyral

pol'yvi'nyl bu'tyral

Pronunciation: [key]
— Chem. Chem.
  1. 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.