malformation

noun

mal·​for·​ma·​tion ˌmal-fȯr-ˈmā-shən 

-fər-

: irregular, anomalous, abnormal, or faulty formation or structure

Examples of malformation in a Sentence

The condition is marked by malformation of the spine.

She underwent surgery to correct a heart malformation.

Recent Examples on the Web

After its manufacturer withdrew it in 1961, more than 10,000 children were found to have been born with severe malformations, in which their limbs were shortened or failed to form. — Mallory Green, The Conversation, 8 Oct. 2026

Common causes include an aneurysm, high blood pressure, head trauma or arteriovenous malformation. — Minyvonne Burke, NBC news, 5 Oct. 2026

Back in 2007, Cash underwent brain surgery following a Stage 1 Chiari malformation diagnosis. — Emily St. Martin, Los Angeles Times, 8 Sep. 2026

Studies have linked phthalates with reproductive problems, such as genital malformations and undescended testes in baby boys and lower sperm counts and testosterone levels in adult males. — Sandee Lamotte, CNN Money, 28 Aug. 2026

Word History

First Known Use

1800, in the meaning defined above

Rhymes for malformation

• abdication
• aberration
• abjuration
• abnegation
• abrogation
• acceptation
• acclamation
• acclimation
• accusation
• activation
• actuation
• acylation

Kids Definition

malformation

noun

mal·​for·​ma·​tion ˌmal-fȯr-ˈmā-shən 

-fər-

: a misshapen, abnormal, or faulty formation or structure

malformation of the knee joint

Medical Definition

malformation

noun

mal·​for·​ma·​tion ˌmal-fȯr-ˈmā-shən, -fər- 

: irregular, anomalous, abnormal, or faulty formation or structure

congenital malformations