Anatomy. a thin, pliable sheet or layer of animal or vegetable tissue, serving to line an organ, connect parts, etc.
Cell Biology. the thin, limiting covering of a cell or cell part.

1375–1425; late Middle English; Middle English membraan parchment < Latin membrāna. See member, -an

membraneless, adjective
intermembrane, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
membrane (ˈmɛmbreɪn)
1.  any thin pliable sheet of material
2.  a pliable sheetlike usually fibrous tissue that covers, lines, or connects plant and animal organs or cells
3.  biology a double layer of lipid, containing some proteins, that surrounds biological cells and some of their internal structures
4.  physics a two-dimensional entity postulated as a fundamental constituent of matter in superstring theories of particle physics
5.  a skin of parchment forming part of a roll
[C16: from Latin membrāna skin covering a part of the body, from membrummember]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1510s, "parchment," from L. membrana "parchment," from membrum "limb, member of the body" (see member). The etymological sense is "that which covers the members of the body." Meaning "thin layer of skin, tissue covering a limb or organ" is attested from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

membrane mem·brane (měm'brān')

  1. A thin pliable layer of tissue covering surfaces, enveloping a part, lining a cavity, or separating or connecting structures or organs.

  2. Cell membrane.

  3. A thin sheet of natural or synthetic material that is permeable to substances in solution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
membrane   (měm'brān')  Pronunciation Key 
  1. A thin, flexible layer of tissue that covers, lines, separates, or connects cells or parts of an organism. Membranes are usually made of layers of phospholipids containing suspended protein molecules and are permeable to water and fat-soluble substances.

  2. See cell membrane.

  3. Chemistry A thin sheet of natural or synthetic material that is permeable to substances in solution.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Their secret is a patented three-layer membrane that lets perspiration out for comfort but prevents all moisture from penetrating.
In reverse osmosis, also known as ultrafiltration, the wine flows along a
  porous cylindrical membrane.
Almost a third of these are embedded in the cell's outer membrane.
On this day, the fishermen debate which is tastier, mullet roe fried intact in
  its membrane or chopped and scrambled with eggs.
Images for membrane
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