The building blocks of English

Affixes

pero-

Deformity.

Greek peros, damaged.

This occurs in a few medical terms, such as perochirus (Greek kheir, hand), a foetus or individual with deformed hands, and peromelia (Greek melos, limb), a congenital deformity of a limb. The general term is peronia, a congenital deformity or anomaly of development.