The Collaborative International Dictionary of English v.0.48:
Bilabiate \Bi*la"bi*ate\, a. [Pref. bi- + labiate.] (Bot.) Having two lips, as the corols of certain flowers. [1913 Webster]WordNet (r) 3.0 (2006):
bilabiate adj 1: having two lips; "the corolla of a snapdragon is bilabiate" [syn: bilabiate, two-lipped]