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.
Origin of membrane
1375–1425; late Middle English; Middle English membraanRelated formsmem·brane·less, adjectivein·ter·mem·brane, adjective
parchment < Latin membrāna.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for membrane
Historical Examples of membrane
British Dictionary definitions for membrane
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
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Word Origin and History for membrane
early 15c., "thin layer of skin or tissue," a term in anatomy, from Latin membrana "a skin, membrane; parchment (skin prepared for writing)," from membrum "limb, member of the body" (see member). The etymological sense is "that which covers the members of the body."
Online Etymology Dictionary, © 2010 Douglas Harper
A thin pliable layer of tissue covering surfaces, enveloping a part, lining a cavity, or separating or connecting structures or organs.
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.
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.