What is "polydactyly"

n. polydactylism.

n. birth defect characterized by the presence of more than the normal number of fingers or toes [syn: hyperdactyly]

Polydactyly or polydactylism , also known as hyperdactyly, is a congenital physical anomaly in humans, dogs, and cats having supernumerary fingers or toes. Polydactyly is the opposite of oligodactyly (fewer fingers or toes).