/ Thesaurus / P Synonyms of plasticiser Find synonyms for: Noun1. plasticizer, plasticiser, softenerusage: a substance added to plastics or other materials to make them more pliableWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language