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A membrane (XVI century, word learned from Latin membrana: kind of "skin" covering the "limbs", of membrum XI century, "any part of the body") designated the flexible and thin envelope surrounding any organ. A second scholarly acceptation by analogy with the Greek Hymen designates a thin layer of flexible material separating two media, more or less porous and permeable.
The word is used with a particular meaning in different domains sometimes neighbor, sometimes opposed to that of wall:
In music:
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