/ Thesaurus / T Synonyms of twelve sided Find synonyms for: Adjective1. twelve-sided, multilateral (vs. unilateral), many-sidedusage: having twelve sidesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language