cell membrane

Definition of cell membrane

Nouns

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"
Synonyms:
cytomembrane, plasma membrane
Type of:
semipermeable membrane
a membrane (as a cell membrane) that allows some molecules to pass through but not others

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