v. i. [ See Extravasate, v. t. ] (Physiol.) To pass by infiltration or effusion from the normal channel, such as a blood vessel or a lymphatic, into the surrounding tissue; -- said of blood, lymph, etc. [ Webster 1913 Suppl. ]
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. [ 1913 Webster ]