semi-permeable


semi-permeable

adjective

  1. permeable only to certain small molecules: a semipermeable membrane.

adjective

  1. (esp of a cell membrane) selectively permeable

adj.1873, from semi- + permeable. Translating German halbdurchlässig. adj.

  1. Partially permeable.
  2. Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.

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