Membranous (adjective)

1. Having or consisting of a thin flexible membrane.
2. Having or covered with a membrane.

Origin:

Late latin membranaceus, from latin membrana ("a skin, hide, parchmen.t")

Examples:

1. The wings of bats are membranous structures.
2. The young plant was covered with a membranous sheath.
3. A membranous sac surrounds the developing fetus.
4. The inner ear is lined with a membranous labyrinth.
5. A membranous structure separates the thorax from the abdomen in insects.