SG Heritage Dictionary

Membranaceous [Adjective] Webster's Dictionary 1828

1. Belonging to a membrane; consisting of membranes; as a membraneous covering.

2. Birds of prey have membranaceous stomachs, not muscular.

3. In botany, a membranaceous leaf has no distinguishable pulp between the two surfaces. In general, it denotes flatted or resembling parchment.

Membranaceous [Adjective] Webster's Dictionary 1913

1. Same as Membranous.

2. Thin and rather soft or pliable, as the leaves of the rose, peach tree, and aspen poplar.