Meaning of “canker sore” in the English Dictionary

british dictionary

"canker sore" in British English

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canker sorenoun [ C ]

uk /ˈkæŋ.kə ˌsɔː/ us /ˈkæŋ.kɚ ˌsɔːr/

a painful swelling in the mouth

(Definition of “canker sore” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)