bul·late /ˈbʊlˌet/ 形容詞
  Bul·late a.  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.
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  bullate
       adj : of leaves; appearing puckered as if blistered