malformation

noun

1. faulty or anomalous formation or structure, especially in a living body: malformation of the teeth.

noun

1. the condition of being faulty or abnormal in form or shape
2. pathol a deformity in the shape or structure of a part, esp when congenital

n.also mal-formation, 1731, from mal- + formation. n.

1. Abnormal or anomalous formation or structure; deformity.