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

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