canker sore

canker sore


Definition of CANKER SORE

: a small painful ulcer especially of the mouth; especially : a painful shallow ulceration of the oral mucous membranes that has a grayish-white base surrounded by a reddish inflamed area and is characteristic of aphthous stomatitis—compare cold sore

Seen & Heard

What made you want to look up canker sore? Please tell us where you read or heard it (including the quote, if possible).