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Comprehensive
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cell membrane the semipermeable membrane that encloses the contents of a cell; plasma membrane.
dialysis the separation of substances in a solution by diffusion through a semipermeable membrane, used to eliminate impurities from the blood in patients with kidney failure.
osmosis the passage or diffusion of a liquid through a semipermeable membrane until the concentration is the same on both sides of the membrane, or the tendency of a liquid to diffuse in such a way. [1/2 definitions]
osmotic pressure the pressure created by a solvent in passing through a semipermeable membrane. (See osmosis.)
plasma membrane the thin, semipermeable membrane that encloses a plant or animal cell.
reverse osmosis a method of filtering pure water molecules out of salt water or polluted water by forcing the water through a semipermeable membrane.