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Douglas Harper's Etymology Dictionary
polydactyl

1894, from French polydactyle (adj.) "having more fingers and toes than is usual," from Greek polydaktylos; see poly- + dactyl. As an adjective from 1874. Related: Polydactyly; polydactylism (1868).

Wiktionary
polydactyl

a. polydactylous. n. A polydactylous animal.

WordNet
polydactyl

adj. of or relating to a person (or other vertebrate) having more than the normal number of digits [syn: polydactylous]

Usage examples of "polydactyl".

At the time, it had puzzled her, and it did again now, for in Ailurin a “sixth claw” was an extra dewclaw, which polydactyl cats might have.