[ek-sos-moh-sis, ek-soz-]
  1. Biology. osmosis toward the outside of a cell or vessel.
  2. Physical Chemistry. the flow of a substance from an area of greater concentration to one of lower concentration (opposed to endosmosis).

Origin of exosmosis

1830–40; Latinization of now obsolete exosmose < French; see ex-2, osmosis
Related formsex·os·mot·ic [ek-sos-mot-ik, -soz-] /ˌɛk sɒsˈmɒt ɪk, -sɒz-/, adjectiveex·os·mot·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for exosmosis


  1. biology osmosis in which water flows from a cell or organism into the surrounding solutionCompare endosmosis
Derived Formsexosmotic (ˌɛksɒzˈmɒtɪk, -sɒs-) or exosmic (ɛkˈsɒzmɪk, -ˈsɒs-), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

exosmosis in Medicine


[ĕk′sŏz-mōsĭs, -sŏs-]
  1. 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.
Related formsex′os•motic (-mŏtĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.