Source : Webster's Revised Unabridged Dictionary (1913)

Trifoliolate \Tri*fo"li*o*late\, a. [Pref. tri- + foliolate.]
   (Bot.)
   Having three leaflets.

Source : WordNet®

trifoliolate
     adj : of a leaf shape; having three leaflets [syn: {trifoliate}, {trifoliated}]