malformation
US /ˌmæl.fɔːrˈmeɪ.ʃən/
UK /ˌmæl.fɔːrˈmeɪ.ʃən/
1.
misvorming
the condition of being wrongly formed, or a part of something, such as part of the body, that is wrongly formed:
:
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Exposure to radiation can lead to malformation of the embryo.