mal·​for·​ma·​tion | \ ˌmal-fȯr-ˈmā-shən How to pronounce malformation (audio) , -fər- \

Definition of malformation

: 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 The fetus had a fatal brain malformation called anencephaly, a condition where parts of the brain and skull are missing. Sony Salzman, ABC News, 19 July 2022 The vascular malformation pushed against a nerve, not dissimilar to sciatica. Meghan Montemurro, Chicago Tribune, 3 June 2022 In Panama, the procedure is only allowed to preserve the mother’s health or life in the case of rape, or fetal malformation. Stefano Pozzebon, CNN, 21 Feb. 2022 She was born in September 2019—nine weeks early, and with a rare brain malformation called lissencephaly. Ed Yong, The Atlantic, 16 Feb. 2022 The dog is 3 years old and has a malformation in her spine and chronic urinary tract infections that require daily medication. Los Angeles Times, 11 Dec. 2021 Doctors diagnosed him with a vascular malformation, a rare, progressive and incurable anomaly of the vascular system. San Diego Union-Tribune, 25 Nov. 2021 Doctors diagnosed him with bipolar disorder and schizophrenia, leading him to receive electroshock therapy, before he was treated for an arteriovenous malformation in his brain. Washington Post, 3 Nov. 2021 Scientists have determined that it’s a male, large, possibly a hybrid, and speculated that its unique song—too low in frequency for humans, too high for whales—might be a result of a malformation. Pakinam Amer, Scientific American, 28 Sep. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'malformation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of malformation

1800, in the meaning defined above

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The first known use of malformation was in 1800

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Last Updated

26 Jul 2022

Cite this Entry

“Malformation.” Dictionary, Merriam-Webster, Accessed 12 Aug. 2022.

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More Definitions for malformation


mal·​for·​ma·​tion | \ ˌmal-fȯr-ˈmā-shən How to pronounce malformation (audio) \

Kids Definition of malformation

: something that is badly or wrongly formed


mal·​for·​ma·​tion | \ ˌmal-fȯr-ˈmā-shən, -fər- How to pronounce malformation (audio) \

Medical Definition of malformation

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


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