- thermoplastic - having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled; "thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change"
Antonyms: thermosetting, thermoset
- thermoplastic, thermoplastic resin - a material that softens when heated and hardens again when cooled
--1 is a kind of plastic
--1 has particulars: saran; celluloid