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A term first used by Dutroehet, to express the action by which fluids pass from without to within organic membranes. The action of two fluids on each other, when separated by a membrane. The general conditions of the phenomena are-first, that they should have an affinity for the interposed membrane; and secondly, that they should have an affinity for each other, and be miscible. At the present day, endosmose is generally used to signify the passage of the more transmissible fluid, whilst exosmose signifies that of the least transmissible. The rapidity with which endosmose is accomplished varies according to the nature of the septum or tissue and of the penetrating body, and to the penetrability of the tissue.

Inward osmosis ; inward passage of liquid through a diaphragm.