[lee-zhuh n]


an injury; hurt; wound.
Pathology. any localized, abnormal structural change in the body.
Plant Pathology. any localized, defined area of diseased tissue, as a spot, canker, blister, or scab.

verb (used with object)

to cause a lesion or lesions in.

Origin of lesion

1425–75; late Middle English < Middle French < Latin laesiōn- (stem of laesiō) injury, equivalent to Latin laes(us) (past participle of laedere to harm, equivalent to laed- verb stem + -tus past participle suffix, with -dt- > -s-) + -iōn- -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for lesion

sore, laceration, contusion, bruise, abrasion, gash, cut, scrape, scratch

Examples from the Web for lesion

Contemporary Examples of lesion

Historical Examples of lesion

British Dictionary definitions for lesion



any structural change in a bodily part resulting from injury or disease
an injury or wound

Word Origin for lesion

C15: via Old French from Late Latin laesiō injury, from Latin laedere to hurt
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

Word Origin and History for lesion

early 15c., from Middle French lesion, from Latin laesionem (nominative laesio) "injury," from past participle stem of laedere "to strike, hurt, damage," of unknown origin. Originally with reference to any sort of hurt, whether physical or not.

Online Etymology Dictionary, © 2010 Douglas Harper

lesion in Medicine




A wound or an injury.
A localized pathological change in a bodily organ or tissue.
An infected or diseased patch of skin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.