a polymer or plastic that undergoes a change in physical or chemical properties when exposed to light.
Origin of photopolymer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a polymeric material that is sensitive to light: used in printing plates, microfilms, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012