noun, noun which may take the genitive case particle 'no'
polydactyly; having extra fingers or toes
Medical term for a congenital condition of having more than the usual number of fingers or toes.
多指は先天性の異常の一つです。
Polydactyly is one of the congenital anomalies.
多指の手術は幼児期に行われることが多い。
Surgery for polydactyly is often performed in early childhood.
Syndactyly, where fingers or toes are fused together, as opposed to having extra digits.
From 多 (many) + 指 (finger) or 趾 (toe), literally 'many fingers/toes'.