Lewis Short
(adjective) : membrānācĕus and -cĭus, a, um, membrana
* Of skin or membrane, skinny, membranaceous (post-Aug.).
* Lit.: vespertilio, cui membranaceae pinnae uni,Plin. 10, 61, 81, § 168: PVGILLARES,of parchment,Inscr. Grut. 174, 7.
* Like a skin or membrane: quibusdam cortex membranaceus, ut viti, arundini,Plin. 16, 31, 55, § 126.
Charlton T. Lewis, Charles Short, A Latin Dictionary