polyvinyl acetal

noun Chemistry.
  1. any of the class of thermoplastic resins derived by the condensation of an aldehyde with polyvinyl alcohol.
  2. the slightly yellow, water-insoluble resin produced from partially hydrolyzed polyvinyl acetate and formaldehyde: used chiefly in the manufacture of lacquers, photographic film, and adhesives.

Origin of polyvinyl acetal

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018