/ Thesaurus / R Synonyms of root canal Find synonyms for: Noun1. root canal, passage, passagewayusage: the passage in the root of a tooth through which its nerve and blood vessels enter the pulp cavityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language