معنی کلمه :‌ 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.

A way or road rasid above the natural level of the ground, serving as a dry passage over wet or marshy ground. But that broad causeway will direct your way. Dryden. The other way Satan went down The causey to Hell-gate. Milton.