The Collaborative International Dictionary of English v.0.48:
Lingulate \Lin"gu*late\ (l[i^][ng]"g[-u]*l[asl]t), a. [L. lingulatus, fr. lingula a little tongue. Cf. Ligulate.] Shaped like the tongue or a strap; ligulate. [1913 Webster]WordNet (r) 3.0 (2006):
lingulate adj 1: shaped like a tongue [syn: lingulate, tongue-shaped]