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

Other steroids like triamcinolone can be injected directly into the lesion. —Matt Fuchs, TIME, 26 Feb. 2025

The ultrasound showed three lesions on Violette's liver, initially prompting the team to schedule an MRI for the baby. —Staff Author, People.com, 21 Feb. 2025

Scientists at the Kanazawa University Graduate School of Medical Sciences found a link between drinking green tea and having a smaller volume of white matter lesions on the brain. —Michael Gfoeller and David H. Rundell, Newsweek, 15 Jan. 2025

Look for products free from harsh ingredients like alcohol, baking soda, parabens, dyes, and fragrances, which can trigger or irritate HS lesions. —Lindsay Curtis, Health, 4 Jan. 2025

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

Rhymes for lesion

• friesian
• adhesion
• artesian
• cartesian
• cohesion
• elysian
• magnesian
• austronesian
• indonesian
• melanesian
• micronesian
• polynesian

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