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cold sore

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noun
  1. a vesicular eruption on the face, usually on or near the mouth, often accompanying a cold or a febrile condition; herpes simplex.
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Origin of cold sore

First recorded in 1905–10
Also called fever blister.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cold sore

cold sore

noun
  1. a cluster of blisters at the margin of the lips that sometimes accompanies the common cold, caused by a viral infectionTechnical name: herpes labialis
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

cold sore in Medicine

cold sore

n.
  1. A small blister occurring on the lips and face and caused by a herpes simplex virus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.