Breadcrumb Home > Thesaurus > P Synonyms of peridinium Find synonyms for: Noun1. Peridinium, genus Peridinium, protoctist genususage: type genus of the family PeridiniidaeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: sepulture Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language