Breadcrumb Home > Thesaurus > P Synonyms of polystyrene Find synonyms for: Noun1. polystyrene, styrene, cinnamene, phenylethylene, vinylbenzeneusage: a polymer of styrene; a rigid transparent thermoplastic; "expanded polystyrene looks like a rigid white foam and is used as packing or insulation"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of polystyrene (Dictionary) ✖ Related Content Daily Word Quiz: solecism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language