[ noun ] (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal <noun.process>
osmosis \os*mo"sis\ ([o^]z*m[=o]"s[i^]s), n. [NL., fr. Gr. 'wsmo`s, equiv. to 'w^sis impulse, fr. 'wqei^n to push.] (Chemical Physics) (a) The tendency in fluids to mix, or become equably diffused, when in contact. It was first observed between fluids of differing densities, and as taking place through a membrane or an intervening porous structure. An older term for the phenomenon was {Osmose}.
Note: The more rapid flow from the thinner to the thicker fluid was then called {endosmosis} (formerly {endosmose}), and the opposite, slower current, {exosmosis} (formerly {exosmose}). Both are, however, results of the same force. Osmosis may be regarded as a form of molecular attraction, allied to that of adhesion. See also {osmotic pressure}. (b) The action produced by this tendency.
"The spontaneous germination of a cultural osmosis between Italy and the United States must not serve as a pretext for neglecting the development of these relations.
Yet the same Zurn unit includes Permutit, an ultra high-tech user of reverse osmosis for water treatment.
"Last year there were counties in the state that did not have a reverse osmosis unit.