【化】 渗透压
【医】 渗透压

[ noun ]
(physical chemistry) the pressure exerted by a solution necessary to prevent osmosis into that solution when it is separated from the pure solvent by a semipermeable membrane
<noun.phenomenon>

osmotic pressure \os*mot"ic pres"sure\, n. (Physical Chemistry)
The pressure which a solution of a substance in a liquid
exerts on a semipermeable membrane, through which the solvent
can diffuse but the dissolved substance (the solute) cannot
diffuse, when separated across the membrane from the pure
solvent. In general, the osmotic pressure will depend almost
proportionally up to certain concentrations upon the molal
concentration of the solute.
[PJC]