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cold sore

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 of cold sore
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cold-sore

cold sore

a cluster of blisters at the margin of the lips that sometimes accompanies the common cold, caused by a viral infection Technical name herpes labialis
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
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cold-sore in Medicine

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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