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Adjective: polydactyl  ,pó-lee'dak-t(u)l
  1. (biology) of or relating to a person (or other vertebrate) having more than the normal number of digits
    "Approximately 60 cats, half of them polydactyl, live in the Ernest Hemingway Museum and Home in Key West";
    - polydactylous

Encyclopedia: Polydactyl