| canker sore n. A small, painful ulcer or sore, usually of the mouth. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  canker sore - an ulceration (especially of the lips or lining of the mouth)ulcer, ulceration - a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue |
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