The Collaborative International Dictionary of English v.0.48:

Thermocautery \Ther`mo*cau"ter*y\, n. [Thermo- + cautery.]
   (Surg.)
   Cautery by the application of heat.
   [1913 Webster]

   Paquelin's thermocautery, thermocautery by means of a
      hollow platinum point, which is kept constantly hot by the
      passage through it of benzine vapor.
      [1913 Webster] Thermochemic

WordNet (r) 3.0 (2006):

thermocautery
    n 1: cautery (destruction of tissue) by heat