/ Thesaurus / S Synonyms of semilunar valve Find synonyms for: Noun1. semilunar valve, heart valve, cardiac valveusage: a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heartWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language