Source : Webster's Revised Unabridged Dictionary (1913)

Encaustic \En*caus"tic\, a. [L. encausticus, Gr. ?, fr. ? to
   burn in; ? in + ? to burn: cf. F. encaustique. See {Caustic},
   and cf. {Ink}.] (Fine Arts)
   Prepared by means of heat; burned in.

   {Encaustic painting} (Fine Arts), painting by means of wax
      with which the colors are combined, and which is
      afterwards fused with hot irons, thus fixing the colors.
      

   {Encaustic tile} (Fine Arts), an earthenware tile which has a
      decorative pattern and is not wholly of one color.