WordReference Random House Unabridged Dictionary of American English © 2017
ex•trav•a•sate  (ik stravə sāt′),USA pronunciation v.,  -sat•ed, -sat•ing, n. 
v.t. 
  1. Pathologyto force out from the proper vessels, as blood, esp. so as to diffuse through the surrounding tissues.
  2. Geologyto pour forth, as lava, from a subterranean source in a molten state.

v.i. 
  1. Pathologyto be extravasated, as blood.
  2. Geologyto pour forth lava or the like.

n. 
  1. Pathologythe extravasated material;
    extravasation.
  • extra- + vas + -ate1 1655–65


Collins Concise English Dictionary © HarperCollins Publishers::

extravasate /ɪkˈstrævəˌseɪt/ vb
  1. to cause (blood or lymph) to escape or (of blood or lymph) to escape into the surrounding tissues from their proper vessels
Etymology: 17th Century: from Latin extra- + vās vessel



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