/ Thesaurus / C Synonyms of circle of willis Find synonyms for: Noun1. circle of Willis, artery, arteria, arterial blood vesselusage: a ring of arteries at the base of the brainWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language