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

  • n. The passage of a fluid through a semipermeable membrane toward a solution of lower concentration, especially the passage of water through a cell membrane into the surrounding medium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. osmosis in which fluid flows through a membrane towards a region of lower concentration

from the GNU version of the Collaborative International Dictionary of English

  • n. See exosmose.

from The Century Dictionary and Cyclopedia

  • n. The passage of gases, vapors, or liquids through membranes or porous media from within outward, in the phenomena of osmosis, the reverse process being called endosmosis. See endosmosis, osmosis.


ex(o)- + osmosis.
(American Heritage® Dictionary of the English Language, Fourth Edition)
exo- +‎ osmosis? (Wiktionary)



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