membranaceous

from The Collaborative International Dictionary of English v.0.48

Membranaceous \Mem`bra*na"ceous\, a. [L. membranaceus.]
   [1913 Webster]
   1. Same as {Membranous}. --Arbuthnot.
      [1913 Webster]

   2. (Bot.) Thin and rather soft or pliable, as the leaves of
      the rose, peach tree, and aspen poplar.
      [1913 Webster]