Source : Webster's Revised Unabridged Dictionary (1913)

Lingulate \Lin"gu*late\ (-l[asl]t), a. [L. lingulatus, fr.
   lingula a little tongue. Cf. {Ligulate}.]
   Shaped like the tongue or a strap; ligulate.

Source : WordNet®

lingulate
     adj : shaped like a tongue [syn: {tongue-shaped}]