Source : Webster's Revised Unabridged Dictionary (1913)

Ustulation \Us`tu*la"tion\, n. [Cf. F. ustulation.]
   1. The act of burning or searing. [R.] --Sir W. Petty.

   2. (Old Chem.) The operation of expelling one substance from
      another by heat, as sulphur or arsenic from ores, in a
      muffle.

   3. (Pharm.)
      (a) The roasting or drying of moist substances so as
          prepare them for pulverizing.
      (b) The burning of wine.

   4. Lascivious passion; concupiscence. [Obs.]

            It is not certain that they took the better part
            when they chose ustulation before marriage,
            expressly against the apostle.        --Jer. Taylor.