pol·y·dac·tyl 
(pŏl′ē-dăktəl) Biology
(pŏl′ē-dăktəl) Biology adj. also pol·y·dac·ty·lous (-tə-ləs)
Having more than the normal number of digits.
n.
A person or animal having more than the normal number of digits.
pol′y·dactyl·ism, pol′y·dacty·ly n.
polydactyl