ˈmemˌbrān sometimes -_brə̇n noun
( -s )
Etymology: Latin membrana skin, membrane, parchment, from membrum member — more at member
1. : a thin soft pliable sheet or layer especially of animal or vegetable origin
2. : a limiting protoplasmic surface or interface — see cell 5
3. : a piece of parchment forming part of a roll
the pages in the … membrane usually were square and had two to four columns to the page — A.T.Robertson