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Definition of Canker sore
1. Noun. An ulceration (especially of the lips or lining of the mouth).
Exact synonyms: Canker
Generic synonyms: Ulcer, Ulceration
Derivative terms: Canker, Canker, Cankerous
Generic synonyms: Ulcer, Ulceration
Derivative terms: Canker, Canker, Cankerous
Medical Definition of Canker sore
1.