cold sore

Definitions of cold sore
  1. noun
    caused by herpes simplex virus type 1 (HSV-1)
    synonyms: fever blister, herpes labialis, oral herpes
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    type of:
    herpes simplex
    an infection caused by the herpes simplex virus; affects the skin and nervous system; produces small temporary (but sometimes painful) blisters on the skin and mucous membranes
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