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- Dictionarylesion/ˈliːʒn/
noun
- 1. a region in an organ or tissue which has suffered damage through injury or disease, such as a wound, ulcer, abscess, or tumour.
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noun
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Abnormal appearance or shape in the tissues of an organism
A lesion is any damage or abnormal change in the tissue of an organism, usually caused by injury or diseases. Lesion is derived from the Latin laesio meaning "injury". Lesions may occur in plants as well as animals. Wikipedia