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.

2. That which is poured out, literally or figuratively.

Wash me with that precious effusion, and I shall be whiter than sow.

The light effusions of a heedless boy.

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.

• an outpouring of liquid
  
• (by extension) an outpouring of speech or emotion
  
• (medicine) the seeping of fluid into a body cavity; the fluid itself