The Collaborative International Dictionary
Tetradactylous
Tetradactylous \Tet`ra*dac"tyl*ous\, a. [Gr. ?; te`tra- (see Tetra-) + ? finger, toe.] (Zo["o]l.) Having, or characterized by, four digits to the foot or hand.
Wiktionary
tetradactylous
a. (context zoology English) Having four digits on the foot or hand.