'Lesion' definitions:

Definition of 'lesion'

From: WordNet
noun
Any localized abnormal structural change in a bodily part
noun
An injury to living tissue (especially an injury involving a cut or break in the skin) [syn: wound, lesion]

Definition of 'Lesion'

From: GCIDE
  • Lesion \Le"sion\ (l[=e]"zh[u^]n), n. [F. l['e]sion, L. laesio, fr. laedere, laesum, to hurt, injure.] A hurt; an injury. Specifically: (a) (Civil Law) Loss sustained from failure to fulfill a bargain or contract. --Burrill. (b) (Med.) Any morbid change in the exercise of functions or the texture of organs. --Dunglison. [1913 Webster]