arachnodactyly
noun
arach·no·dac·ty·ly
| \ ə-ˌrak-nō-ˈdak-tə-lē
\
\
plural arachnodactylies
Medical Definition of arachnodactyly
: a hereditary condition characterized especially by excessive length of the fingers and toes — see congenital contractural arachnodactyly