The meaning of CANKER SORE is 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.
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Synonyms for SORE: aching, painful, hurting, swollen, damaging, achy, nasty, injurious; Antonyms of SORE: painless, healing, indolent, helping, remedial, curative, pleased, delighted