Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Biology A thin, pliable layer of tissue covering surfaces or separating or connecting regions, structures, or organs of an animal or a plant.
  • n. Biology Cell membrane.
  • n. A piece of parchment.
  • n. Chemistry A thin sheet of natural or synthetic material that is permeable to substances in solution.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A flexible enclosing or separating tissue forming a plane or film and separating two environments (usually in a plant or animal).
  • n. A mechanical, thin, flat flexible part that can deform or vibrate when excited by an external force.
  • n. A flexible or semi-flexible covering or waterproofing whose primary function is to exclude water.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A thin pliable expansive structure of the body; an expansion of any soft tissue or part in the form of a sheet or layer, investing or lining some other structure or connecting two or more structures.
  • n. In entomology, specifically, the membranous terminal part of a hemielytrum; the membrane of the fore wing of a hemipter. See cut under clavus.
  • n. A skin prepared for being written on.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a thin pliable sheet of material
  • n. a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

Etymologies

Latin membrāna, skin, from membrum, member of the body.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin membrana ("skin of body"). (Wiktionary)

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