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Wordnet 3.0

NOUN (3)

1. an extravasated liquid (blood or lymph or urine); the product of extravasation;

2. (of volcanos) pouring out fumes or lava (or a deposit so formed);
[syn: eruption, eructation, extravasation]

3. the process of exuding or passing out of a vessel into surrounding tissues; said of blood or lymph or urine;

The Collaborative International Dictionary of English v.0.48:

Extravasation \Ex*trav`a*sa"tion\, n. [Cf. F. extravasation.] 1. The act of forcing or letting out of its proper vessels or ducts, as a fluid; effusion; as, an extravasation of blood after a rupture of the vessels. [1913 Webster] 2. (Geol.) The issue of lava and other volcanic products from the earth. [Webster 1913 Suppl.]