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Presence of more than five digits on hand or foot.
[poly- + G. daktylos, finger]
polydactylism/poly·dac·tyl·ism/ (-dak´til-izm) polydactyly.
polydactyly; polydactylism; supernumerary digits >5 digits on hands/feet, with/without additional metacarpals/metatarsals; supernumerary toes are often amputated to improve foot function and shoe fit
the presence of supernumerary digits; occurs as an inherited defect in cattle, cats and some breeds of dogs; occurs not uncommonly also in horses.