[f. EXTRAVASATE v.: see -ATION. Cf. F. extravasation.]

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  1.  Path. The escape of an organic fluid (e.g., blood, sap) from its proper vessels into the surrounding tissues; an instance of this.

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1676.  Wiseman, Chirurg. Treat., I. i. 2. The Plenitude of Vessels … causeth an Extravasation of bloud.

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1796.  Morse, Amer. Geog., I. 338. A stagnation and extravasation of the juices of the stalk.

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1836.  Todd, Cycl. Anat., I. 400/1. The extravasation of urine.

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1877.  Roberts, Handbk. Med., I. 28. Points of redness … due to minute extravasations of blood.

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  fig.  1685.  Burnet, Lett. (1687), 143. Such an extravasation … of silver, occasions a great deadness in Trade.

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1691.  Beverley, Mem. Kingd. Christ, 9. God having suffer’d … so dangerous an Extravasation of the French Power.

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  b.  A mass or spot of extravasated blood.

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1836.  Todd, Cycl. Anat., I. 52/2. On the substance of the extravasation there were a … number of spots of red blood.

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1878.  A. M. Hamilton, Nerv. Dis., 19. The crura and pons are to be examined carefully for softening extravasations.

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  2.  Geol. Effusion (of molten rock) from a subterranean reservoir; also, a deposit so formed.

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1842.  G. P. Scrope, Volcanos, 9. To permit an extravasation of some of the heated and liquefied and gaseous matters.

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1864.  C. P. Smyth, Our Inheritance, II. viii. (1880), 144. Amongst the veins and extravasations of granite and basalt.

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