The Collaborative International Dictionary of English v.0.48:

Bilobate \Bi*lo"bate\ (b[-i]*l[=o]"b[asl]t or
   b[imac]"l[-o]*b[asl]t), a. [Pref. bi- + lobate.]
   Divided into two lobes or segments.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bilobate
    adj 1: having two lobes; "a bilobate leaf" [syn: bilobate,
           bilobated, bilobed]