cold sore

noun
a vesicular eruption on the face, usually on or near the mouth, often accompanying a cold or a febrile condition; herpes simplex.
Also called fever blister.


Origin:
1905–10

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Collins
World English Dictionary
cold sore
 
n
Technical name: herpes labialis a cluster of blisters at the margin of the lips that sometimes accompanies the common cold, caused by a viral infection

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

cold sore n.
A small blister occurring on the lips and face and caused by a herpes simplex virus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
He had the beginning of a cold sore in the middle of his upper lip.
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