If people or parts of their body are malformed, they do not have the shape or form that they are supposed to, especially when they have been like this since birth.
例句
...malformed babies...畸形婴儿More rarely, the tubes have been malformed from birth.这些管状器官先天畸形的现象更加少见。
英英词典释义
Adjective
1. so badly formed or out of shape as to be ugly;
"deformed thalidomide babies""his poor distorted limbs""an ill-shapen vase""a limp caused by a malformed foot""misshapen old fingers"