lesion

noun

le·​sion ˈlē-zhən 

1

: injury, harm

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

lesioned

ˈlē-zhənd 

adjective

Examples of lesion in a Sentence

Recent Examples on the Web

On the call, McKee gently shared the diagnosis: Myers had had stage 1 CTE, characterized by one to three microscopic lesions. —Alex Morris, Rolling Stone, 9 Sep. 2023

Over-the-counter cortisone cream can help alleviate symptoms, but do not scratch or pick the lesions since that can cause further infection, Dr. Jacobs adds. —Andi Breitowich, Women's Health, 8 Sep. 2023

The performer also has frontal lobe lesions, which affect her working memory and planning abilities. —Elizabeth Myong, Dallas News, 9 Aug. 2023

This wasn’t a lesion in the temporal lobe, or epilepsy. —Jordan Crucchiola, Vulture, 7 Aug. 2023

Researchers are using machine-learning to build tools in the realm of cancer detection and diagnosing, potentially catching tumors or lesions that doctors could miss. —Mary Kekatos, ABC News, 21 July 2023

Then, in August, Row underwent surgery to remove pelvic lesions, which had unfortunately become cancerous, according to Heavy. —Brenton Blanchet, Peoplemag, 11 Sep. 2023

In that case, injuries can compound until the brain is overwhelmed, until — unable to reconfigure themselves — the tau proteins essentially rot, creating toxic lesions that spread deeper into the brain and even sometimes into the brain stem. —Alex Morris, Rolling Stone, 9 Sep. 2023

First lady Jill Biden has cancerous lesion removed from near her right eye A health care provider, such as a dermatologist, may perform a full-body skin exam to look for any abnormal spots as well as an exam of the lymph nodes because the cancer can spread quickly. —Mary Kekatos, ABC News, 4 Sep. 2023

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Word History

Etymology

Middle English, from Anglo-French, from Latin laesion-, laesio, from laedere to injure

First Known Use

15th century, in the meaning defined at sense 1

Kids 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

lesion

1 of 2 noun

le·​sion ˈlē-zhən 

: an abnormal change in structure of an organ or part due to injury or disease

especially : one that is circumscribed and well defined

lesioned

-zhənd 

adjective

lesion

2 of 2 transitive verb

: to produce lesions in (as an animal's brain)

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 enrichment

Etymology

Anglo-French, damage, injury, from Latin laesio, from laedere to injure