/ Thesaurus / I Synonyms of imperforate anus Find synonyms for: Noun1. imperforate anus, anususage: a congenital defect of the anus; there is partial or complete obstruction of the anal openingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language