Breadcrumb Home > Thesaurus > P Synonyms of polypropylene Find synonyms for: Noun1. polypropylene, polypropene, plasticusage: a polymer of propylene used as a thermoplastic molding materialWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of polypropylene (Dictionary) ✖ Related Content Daily Word Quiz: temporize Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language