Membrane
/mˈɛˌmbreɪn/
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Definition
(noun) A flexible enclosing or separating tissue forming a plane or film and separating two environments.
Sentence Examples
Reverse osmosis consists in forcing seawater through a membrane that filters out the salt.
The mucous membrane is very sensitive.
CEFR Practice Quiz
The thin ____ protects the inner parts of the cell and regulates what can enter and leave it.