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

At 14 weeks, Martinez learned the baby had a rare, severe congenital brain malformation. —Cindy Krischer Goodman, Sun Sentinel, 2 May 2026

If the fetus survives, long-term developmental delays, blindness, hearing loss, permanent teeth and bone malformation, heart defects and rashes can occur. —Casey Pinto, The Conversation, 1 May 2026

Studies document high rates of miscarriages, congenital malformations and infant mortality among populations exposed to environments contaminated with cobalt and other metals. —Abraham Nunbogu, Fortune, 29 Apr. 2026

Before hitting the road with Zach Brown in 2019, White — who was 35 years old at the time — was diagnosed with a rare brain condition called arteriovenous malformation (AVM). —Christina Dugan Ramirez, FOXNews.com, 21 Apr. 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