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Definition of canker sore noun from the Oxford Advanced Learner's Dictionary

canker sore

noun

/ˈkæŋkə sɔː(r)/

/ˈkæŋkər sɔːr/

(also canker)

(both North American English)

(British English mouth ulcer)

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a small painful area in the mouth

See canker sore in the Oxford Advanced American Dictionary

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canker sore

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B2

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