THERMOPLASTIC Scrabble 22 Words With Friends 25 Definition adjective having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled. noun a material that softens when heated and hardens again when cooled. — synonyms: thermoplastic_resin See all 3541 words you can make from THERMOPLASTIC → 13-letter words Words starting with T Words ending with C ← Unscramble different letters