[f. L. extrā outside + vās vessel + -ATE3. Cf. F. extravaser.]
1. trans. To let or force out (a fluid, esp. blood) from its proper vessel.
1669. W. Simpson, Hydrol. Chym., 31. The exorbitant latex, which before was extravasated.
1684. Boyle, Porousn. Anim. & Solid Bod., iii. 17. Small portions of blood … being extravasated are obliged to stagnate there.
1748. Hartley, Observ. Man, I. i. 44. Blood and Serum extravasated, and lying in the Ventricles, suffocate Sensations.
1764. Watson, in Phil. Trans., LIV. 244. As … injuries to the lungs are not easily removed, when once a rupture is made, every fit of coughing extravasates more air.
1797. M. Baillie, Morb. Anat. (1807), 349. The matter which had been extravasated during the inflammation.
1880. Mac Cormac, Antisept. Surg., 103. Blood is extravasated into the tissues.
2. intr. for refl. Of a fluid: To flow out; to force its way out, to escape.
1686. W. Harris, trans. Lemery’s Chym., II. xiv. (ed. 3), 345. The keen Salts which … raised great effervescencies in the blood so as to make it extravasate.
1774. Goldsm., Nat. Hist., VIII. 82. The juice or sap, turn’d back from its natural course extravasates.
1847. Todd, Cycl. Anat., III. 641/2. Blood sometimes extravasates into the arachnoid sac.
