Emily Dickinson Lexicon

ZYG-O-DAC'TYL-OUS, a. [Gr. ζυγοω, to join, and δακτυλος, a finger.]

Having the toes disposed in pairs; distinguishing an order of fowls which have the feet furnished with two toes before and two behind, as, the parrot, woodpecker, &c. – Ed. Encyc.