Source : Webster's Revised Unabridged Dictionary (1913)

Tridactyl \Tri*dac"tyl\ Tridactyle \Tri*dac"tyle\, a. [Gr. ?: ?
   (see {Tri-}) + ? digit: cf. F. tridactyle.] (Biol.)
   Having three fingers or toes, or composed of three movable
   parts attached to a common base.