Tridactyl Definition
 trī-dăktəl 
    adjective
  
 Having three digits on each extremity.
 American Heritage 
(biology) Composed of three movable parts attached to a common base.
 Wiktionary 
Origin of Tridactyl
-  
Greek tridaktulos three-fingered tri- tri- trei- in Indo-European roots daktulos finger
From American Heritage Dictionary of the English Language, 5th Edition
 tri- + Ancient Greek δάκτυλος (dáktulos, “finger").
From Wiktionary
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