Ex'os-mōse or Ex'os-mō'sis, n.

n. [Gr. ἔξω, outside, and Gr. as if ὠσμωσις, for ὠσμός, ὤσις, ὠθησις, a thrusting, thrust, from ὠθεῖν, to thrust, push, shove; Fr. exosmose.] The passage of gases, vapors, or liquids through membranes or porous media from within outward, in the phenomena of osmose. See OSMOSE.