canker sore


canker sore

noun

: a small painful sore inside the mouth

Full 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

First Known Use of CANKER SORE

circa 1596

canker sore

noun    (Medical Dictionary)

Medical 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

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