Definition of lesion:
blemish (part of speech: noun)
The characteristic lesion of foot- and- mouth disease is the appearance of blisters containing a serous fluid upon the mucous membrane of the mouth and upon the udder, teats, and feet of the affected animals.- "Special Report on Diseases of Cattle", U.S. Department of Agriculture J.R. Mohler.
Where a lesion of the brain has occurred, and a distinct change has thus been brought about in the physical structure of that organ, an attempt to bring about a cure would be a waste of time- hopeless from the start.- "Stammering, Its Cause and Cure", Benjamin Nathaniel Bogue.
- "The Fruit of the Tree", Edith Wharton.