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

If the patient has lesions that are deep in the skin or involve the lymph nodes, the chance of melanoma spreading is higher — anywhere from 20% to 70%, according to Jose Lutzky, MD, director of cutaneous oncology services at the Sylvester Comprehensive Cancer Center in South Florida. —Melissa Rudy, FOXNews.com, 12 Aug. 2025

Low-grade squamous intraepithelial lesions (LSIL): Typically indicates HPV infection and that more testing is needed. —Elizabeth Yuko, Flow Space, 4 Aug. 2025

Those who develop new, unexplained skin rashes (lesions on any part of the body), with or without fever and chills, should seek immediate medical care. —Isabel Van Brugen, MSNBC Newsweek, 4 Aug. 2025

Symptoms are broad but can include fever, malaise, skin lesions, and swollen lymph nodes. —Fort Worth Star-Telegram, 24 July 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