1. The act of burning or searing. [R.]
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.