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
Symptoms include angular red, purple, or brown lesions on the upper surfaces of leaves, often between veins, with whitish fungal growth on the undersides.
—
Rita Perwich, San Diego Union-Tribune, 2 May 2026
Other symptoms include hair loss, mouth lesions, hearing loss and vision changes, but these symptoms may not all appear.
—Casey Pinto, The Conversation, 1 May 2026
But his condition only worsened, and the lesions only progressed.
—Beth Mole, ArsTechnica, 1 May 2026
The skin lesions can be painful and result in serious infection or other health conditions, AHRQ reports, and can often lengthen hospital stays.
—Roni Robbins, AJC.com, 29 Apr. 2026
See All Example Sentences for lesion
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Rita Perwich, San Diego Union-Tribune, 2 May 2026
Other symptoms include hair loss, mouth lesions, hearing loss and vision changes, but these symptoms may not all appear.
—Casey Pinto, The Conversation, 1 May 2026
But his condition only worsened, and the lesions only progressed.
—Beth Mole, ArsTechnica, 1 May 2026
The skin lesions can be painful and result in serious infection or other health conditions, AHRQ reports, and can often lengthen hospital stays.
—Roni Robbins, AJC.com, 29 Apr. 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 6 May. 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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