[ mem-breyn ]
/ ˈmɛm breɪn /
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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.



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Origin of membrane

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


mem·brane·less, adjectivein·ter·mem·brane, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for membrane

British Dictionary definitions for membrane

/ (ˈmɛmbreɪn) /


any thin pliable sheet of material
a pliable sheetlike usually fibrous tissue that covers, lines, or connects plant and animal organs or cells
biology a double layer of lipid, containing some proteins, that surrounds biological cells and some of their internal structures
physics a two-dimensional entity postulated as a fundamental constituent of matter in superstring theories of particle physics
a skin of parchment forming part of a roll

Word Origin for membrane

C16: from Latin membrāna skin covering a part of the body, from membrum member
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for membrane

[ mĕmbrān′ ]


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

Scientific definitions for membrane

[ mĕmbrān′ ]

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.
See cell membrane.
Chemistry A thin sheet of natural or synthetic material that is permeable to substances in solution.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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