/ Thesaurus / C Synonyms of cardinal vein Find synonyms for: Noun1. cardinal vein, vein, vena, venous blood vesselusage: any of the major venous channels in primitive adult vertebrates and in embryos of higher vertebratesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language