reverse osmosis

noun Chemistry.
the process in which pure water is produced by forcing waste or saline water through a semipermeable membrane.

Origin:
1950–55

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Collins
World English Dictionary
reverse osmosis
 
n
a technique for purifying water, in which pressure is applied to force liquid through a semipermeable membrane in the opposite direction to that in normal osmosis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

reverse osmosis n.
The movement of a solvent in the opposite direction from osmosis in such a manner that the solvent moves from a solution of greater concentration through a membrane to a solution of lesser concentration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
reverse osmosis  


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A method of producing pure water by forcing saline or impure water through a semipermeable membrane across which salts or impurities cannot pass. Reverse osmosis is used for water filtration, for desalinization of seawater, and in kidney dialysis machines.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The membranes used in reverse osmosis are unsuitable for this process because they work best at high pressures.
Pumped storage would work for them, as would reverse osmosis water production.
Let me start by saying that my reverse osmosis water system is great.
They have an ample supply of water to treat and can return the residuals from the reverse osmosis process to the ocean.
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