Extravasation \Ex*trav`a*sa"tion\, n. (Geol.) The issue of lava and other volcanic products from the earth.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Extravasation \Ex*trav`a*sa"tion\, n. [Cf. F. extravasation.]

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.

Source: Webster's Revised Unabridged Dictionary (1913)