2
: an abnormal change in structure of an organ or part due to injury or disease
especially
: one that is circumscribed (see circumscribe sense 1) and well defined
Examples of lesion in a Sentence
Recent Examples on the Web
Quantitative Insight: Software measures lesion size, growth rate and tissue composition with sub-millimeter precision, turning qualitative impressions into actionable numbers for personalized care.
—
Yidi Xu, Forbes.com, 26 June 2025
Skin lesions, particularly gray patches, are becoming more prevalent in southern resident orcas, Weiss added, so allokelping might be a way to treat those lesions.
—Marlowe Starling, CNN Money, 23 June 2025
Nearly 500,000 people are diagnosed with Lyme disease each year in the U.S. For about 75% of them, the first sign will be a skin lesion that appears one to four weeks after being bitten by an infected deer tick.
—Angela Haupt, Time, 18 June 2025
Would that early liver tumor—or that pancreatic lesion—have proved fatal without intervention?
—Siddhartha Mukherjee, New Yorker, 16 June 2025
See All Example Sentences for lesion
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Yidi Xu, Forbes.com, 26 June 2025
Skin lesions, particularly gray patches, are becoming more prevalent in southern resident orcas, Weiss added, so allokelping might be a way to treat those lesions.
—Marlowe Starling, CNN Money, 23 June 2025
Nearly 500,000 people are diagnosed with Lyme disease each year in the U.S. For about 75% of them, the first sign will be a skin lesion that appears one to four weeks after being bitten by an infected deer tick.
—Angela Haupt, Time, 18 June 2025
Would that early liver tumor—or that pancreatic lesion—have proved fatal without intervention?
—Siddhartha Mukherjee, New Yorker, 16 June 2025
See All Example Sentences for lesion
Cite this Entry
“Lesion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lesion. Accessed 4 Jul. 2025.
Copy CitationKids Definition
lesion
noun
le·sion
ˈlē-zhən 
: a change in the structure of a bodily organ or part due to injury or disease
especially
: an injured or diseased spot or area clearly marked off from healthy tissue around it
Medical Definition
Legal Definition
lesion
noun
le·sion
ˈlē-zhən
in the civil law of Louisiana
: loss from failure to receive a threshold amount or value (as one-half market value) for immovable property conveyed or transferred by a commutative contract (as a sale or exchange)
called also lesion beyond moiety
compare unjust enrichmentEtymology
Anglo-French, damage, injury, from Latin laesio, from laedere to injure
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