From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
From WordNet (r) 3.0 (2006) [wn]:
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