Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing something that is permeable to some things and not to others, as a cell membrane which allows some molecules through but blocks others substances.

from The Century Dictionary and Cyclopedia

  • Capable of permitting the passage of certain molecules and of impeding that of others; said of membranes or septa which are permeable to the molecules of a solvent such as water, but which prevent the diffusion of the molecules of the dissolved substance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of a membrane) selectively permeable

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