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From: Webster's Revised Unabridged Dictionary (1913)

 Mem·brane n.  Anat. A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids.
 Note:The term is also often applied to the thin, expanded parts, of various texture, both in animals and vegetables.
 Adventitious membrane, a membrane connecting parts not usually connected, or of a different texture from the ordinary connection; as, the membrane of a cicatrix.
 Jacob's membrane. See under Retina.
 Mucous membranes Anat., the membranes lining passages and cavities which communicate with the exterior, as well as ducts and receptacles of secretion, and habitually secreting mucus.
 Schneiderian membrane. Anat. See Schneiderian.
 Serous membranes Anat. , the membranes, like the peritoneum and pleura, which line, or lie in, cavities having no obvious outlet, and secrete a serous fluid.