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Definition of Cell membrane
1. Noun. A thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell. "All cells have a cell membrane"
Exact synonyms: Cytomembrane, Plasma Membrane
Group relationships: Cell
Generic synonyms: Semipermeable Membrane
Group relationships: Cell
Generic synonyms: Semipermeable Membrane
Medical Definition of Cell membrane
1.