semipermeable membrane

Noun
  1. A membrane (as a cell membrane) that allows some molecules to pass through but not others (synset 105454999)
    is a type of: membrane, tissue layer - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
    subtypes: cell membrane, cytomembrane, plasma membrane - 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

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