| Membranous 1. (a.) Pertaining to, consisting of, or resembling, membrane; as, a membranous covering or lining. 2. (a.) Membranaceous. Thesaurus Entries filmy, foliaceous, foliated, in layers, lamellar, lamellate, lamellated, lamelliform, laminate, laminated, laminous, leaflike, leafy, scummy, spathic, spathose, stratified, stratiform, three-ply, two-ply |