The Collaborative International Dictionary
Didactyl
Didactyl \Di*dac"tyl\, n. [Gr. di- = di`s- twice + ? finger, toe: cf. F. didactyle.] (Zo["o]l.) An animal having only two digits.
Wiktionary
didactyl
a. (context zoology English) Having only two toes, fingers or claws. n. A didactyl animal.