Definition of lesion noun from the Oxford Advanced Learner's Dictionary

 

lesion

 noun
noun
BrE BrE//ˈliːʒn//
 
; NAmE NAmE//ˈliːʒn//
 
(medical)
 
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damage to the skin or part of the body caused by injury or by illness skin/brain lesions Word Origin late Middle English: via Old French from Latin laesio(n-), from laedere ‘injure’.
See the Oxford Advanced American Dictionary entry: lesion