le·sion (lē'zhən)
n.

1. A wound or injury.
2. A localized pathological change in a bodily organ or tissue.
3. An infected or diseased patch of skin.

tr.v., -sioned, -sion·ing, -sions.
To cause a lesion to form on or in.

[Middle English lesioun, from Old French lesion, from Latin laesiō, laesiōn-, from laesus, past participle of laedere, to injure.]

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The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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