Breadcrumb Home > Thesaurus > P Synonyms of planarian Find synonyms for: Noun1. planarian, planaria, flatworm, platyhelminthusage: free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost partsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of planarian (Dictionary) ✖ Related Content Daily Word Quiz: sepulture Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language