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
Both viruses caused respiratory infections that awakened dormant DCCs in the lungs, leading to a huge expansion of metastatic cells within days of infection and the appearance of metastatic lesions within two weeks.
—
Elizabeth Yuko, Flow Space, 24 Sep. 2025
In September, Biden underwent surgery to remove skin cancer lesions after his office disclosed in May that he had been diagnosed with an aggressive prostate cancer that had spread to his bones.
—Kate Plummer, MSNBC Newsweek, 23 Sep. 2025
According to results from a Sunday procedure to have skin lesions removed, doctors found squamous cell carcinoma, which starts in cells in the middle and outer layers of the skin.
—Michael Rios, CNN Money, 17 Sep. 2025
Bolsonaro underwent a series of medical treatments in Brasilia on Sunday, including laboratory tests and surgical removal of skin lesions.
—Reuters, NBC news, 16 Sep. 2025
See All Example Sentences for lesion
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Elizabeth Yuko, Flow Space, 24 Sep. 2025
In September, Biden underwent surgery to remove skin cancer lesions after his office disclosed in May that he had been diagnosed with an aggressive prostate cancer that had spread to his bones.
—Kate Plummer, MSNBC Newsweek, 23 Sep. 2025
According to results from a Sunday procedure to have skin lesions removed, doctors found squamous cell carcinoma, which starts in cells in the middle and outer layers of the skin.
—Michael Rios, CNN Money, 17 Sep. 2025
Bolsonaro underwent a series of medical treatments in Brasilia on Sunday, including laboratory tests and surgical removal of skin lesions.
—Reuters, NBC news, 16 Sep. 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 2 Oct. 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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