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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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  1. a small painful area in the mouth
See canker sore in the Oxford Advanced American Dictionary
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influence
verb
 
 
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