[ lee-zhuh n ]
/ ˈli ʒən /


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. 2020

Examples from the Web for lesion

British Dictionary definitions for lesion

/ (ˈliːʒən) /


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

Medical definitions for lesion

[ lēzhən ]


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.