/ Thesaurus / S Synonyms of septal defect Find synonyms for: Noun1. septal defect, congenital heart defectusage: a congenital abnormality in the septum between the left and right sides of the heartWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language