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: 1425–75;late Middle English < Middle French < Latinlaesiōn- (stem of laesiō) injury, equivalent to Latinlaes(us) (past participle of laedere to harm, equivalent to laed- verb stem + -tus past participle suffix, with -dt- > -s-) + -iōn--ion