/ Thesaurus / P Synonyms of peridiniidae Find synonyms for: Noun1. Peridiniidae, family Peridiniidae, protoctist familyusage: marine and freshwater dinoflagellatesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language