/ Dictionary / Index C canker sore: Meaning and Definition of Find definitions for: can'ker sore" Pronunciation: [key] — Pathol. Pathol. an ulceration of a mucous membrane, esp. of the mouth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cankerous cankerworm Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language