The Collaborative International Dictionary of English v.0.48:
Trifoliolate \Tri*fo"li*o*late\, a. [Pref. tri- + foliolate.] (Bot.) Having three leaflets. [1913 Webster]WordNet (r) 3.0 (2006):
trifoliolate adj 1: (of a leaf shape) having three leaflets [syn: trifoliate, trifoliolate, trifoliated]