cell membrane

from WordNet (r) 3.0 (2006)
cell membrane
    n 1: 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" [syn:
         {cell membrane}, {cytomembrane}, {plasma membrane}]
    

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