adj. becoming permanently hard or solidifying when heated; used especially of synthetic plastics such as Bakelite.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having the property of becoming permanently hard and rigid when heated or cured
Word Usage
"Includes discussion of natural polymers from tropical trees and the vulcanization of rubber, semi-synthetics (such as celluloid), thermosetting plastics (such as Bakelite), amino plastics (such as melamine), thermoplastics, and high-tech plastics."