\Ef*fu"sion\, n. [L. effusio: cf. F. effusion.]
1. The act of pouring out; as, effusion of water, of blood,
   of grace, of words, and the like.
         To save the effusion of my people's blood. --Dryden.
2. That which is poured out, literally or figuratively.
         Wash me with that precious effusion, and I shall be
         whiter than sow.                      --Eikon
                                               Basilike.
         The light effusions of a heedless boy. --Byron.
3. (Pathol.)
   (a) The escape of a fluid out of its natural vessel,
       either by rupture of the vessel, or by exudation
       through its walls. It may pass into the substance of
       an organ, or issue upon a free surface.
   (b) The liquid escaping or exuded.