Bullate \Bul"late\ (b[u^]l"l[asl]t/), a. [L. bullatus, fr. bulla bubble.]

(Biol.) Appearing as if blistered; inflated; puckered.

Bullate leaf (Bot.), a leaf, the membranous part of which rises between the veins puckered elevations convex on one side and concave on the other.

Source: Webster's Revised Unabridged Dictionary (1913)