reverse osmosis(redirected from Reverse osmoisis)
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Related to Reverse osmoisis: electrodialysis
reverse osmosis[ri′vərs äs′mō·səs]
A technique used in desalination and waste-water treatment; pressure is applied to the surface of a saline (or waste) solution, forcing pure water to pass from the solution through a membrane (hollow fibers of cellulose acetate or nylon) that will not pass sodium or chloride ions.