Simple Definition of lesion

from our Learner's Dictionary

lesion

noun

ˈliːʒən

plural lesions

medical : an injured or diseased spot or area on or in the body

skin lesions

a brain lesion

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“Lesion.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/lesion. Accessed 19 Jun. 2026.

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