malformation

The condition of being malformed; deformity.

A body part that is malformed; a deformity.

Faulty formation; irregular or anomalous formation or structure, especially in a living body; a deviation from the normal form or structure either in the whole or in part of an organ. Also, until recently, maleformation.

Ill formation; irregular or anomalous formation; abnormal or wrong conformation or structure; — often used of body parts such as limbs which do not develop properly during fetal maturation.

An abnormal formation.

An abnormal developmental feature of offspring.

something abnormal or anomalous

an affliction in which some part of the body is misshapen or malformed