tridactylPronunciation: /trʌɪˈdaktɪl/Definition of tridactyl adjective Zoology (of a vertebrate limb) having three toes or fingers. Derivatives tridactyly noun Origin: early 19th century: from tri- 'three' + Greek daktulos 'finger'tridactyl in other Oxford dictionaries Definition of tridactyl in the US English dictionary