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
Its early symptoms include lesions around the infection site, fever and fatigue.
—
Emma Gometz, Scientific American, 22 Jan. 2026
Computer vision algorithms trained on over 50,000 clinical data points segment and classify every lesion, assigning risk scores for each.
—Craig S. Smith, Forbes.com, 21 Jan. 2026
After eight weeks, 75% of participants treated with the Corvus pill, called soquelitinib, achieved at least a 75% improvement in the extent and severity of skin lesions — an efficacy metric known as EASI 75 — compared to 20% of participants offered a placebo, the company said.
—Adam Feuerstein, STAT, 20 Jan. 2026
The most common problem was persistent lesions in one or more areas of the body.
—Mary Kekatos, ABC News, 19 Jan. 2026
See All Example Sentences for lesion
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Emma Gometz, Scientific American, 22 Jan. 2026
Computer vision algorithms trained on over 50,000 clinical data points segment and classify every lesion, assigning risk scores for each.
—Craig S. Smith, Forbes.com, 21 Jan. 2026
After eight weeks, 75% of participants treated with the Corvus pill, called soquelitinib, achieved at least a 75% improvement in the extent and severity of skin lesions — an efficacy metric known as EASI 75 — compared to 20% of participants offered a placebo, the company said.
—Adam Feuerstein, STAT, 20 Jan. 2026
The most common problem was persistent lesions in one or more areas of the body.
—Mary Kekatos, ABC News, 19 Jan. 2026
See All Example Sentences for lesion
Cite this Entry
“Lesion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lesion. Accessed 28 Jan. 2026.
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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