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English definition of “canker sore”

canker sore

noun [C]     /ˈkæŋ.kə sɔː/ US  /ˈkæŋ.kər ˌsɔr/
a painful swelling in the mouthSwellings and lumps
(Definition of canker sore noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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