Source : Webster's Revised Unabridged Dictionary (1913)

Extravasate \Ex*trav"a*sate\, v. t. [imp. & p. p.
   {Extravasated}; p. pr. & vb. n. {Extravasating}.] [Pref.
   extra- + L. vas vessel: cf. F. extravaser. See {Vase}.]
   To force or let out of the proper vessels or arteries, as
   blood.