1. The release of blood or lymph from their vessels into the adjacent tissue: Not only did Janet bleed after hurting herself during the bicycle accident, but she also noticed an extravasation in her right arm, which was badly bruised.
2. The emission of volcanic products, like ash and fumes, from the Earth: The soil resulting from the extravasation of Etna, one of the world’s most active volcanos, is very fertile and is used in agriculture; for example, in orchards and vineyards.