cold sore

noun
Updated on: 5 Mar 2018

Definition of cold sore

: a group of fluid-filled blisters appearing about or within the mouth that are caused by a herpes simplex virus and upon rupturing form crusts called also fever blister; compare canker sore

Recent Examples of cold sore from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cold sore.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of cold sore

1870

in the meaning defined above

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COLD SORE Defined for English Language Learners

cold sore

Definition of cold sore for English Language Learners

  • : a small sore area around or inside the mouth that is caused by a virus


Medical Dictionary

cold sore

noun

medical Definition of cold sore

: a vesicular lesion that typically occurs in or around the mouth, that initially causes pain, burning, or itching before bursting and crusting over, and that is caused by a herpes simplex virus which remains dormant in the body and may be reactivated by a variety of factors (as stress, fever, or sunburn) called also fever blister; compare canker sore

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