View your list of saved words. (You can log in using Facebook.)
About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.
Definition of CANKER SORE
: a painful shallow ulcer of the mouth that has a grayish-white base surrounded by a reddish inflamed area and is of uncertain cause but is not due to the virus causing herpes simplex — compare cold 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