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


cold sore

BrE BrE//ˈkəʊld sɔː(r)//
; NAmE NAmE//ˈkoʊld sɔːr//
(North American English also fever blister)
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a small painful spot on the lips or inside the mouth that is caused by a virus
See the Oxford Advanced American Dictionary entry: cold sore