1. The act of burning or searing. (Sir W. Petty)

2. <chemistry> The operation of expelling one substance from another by heat, as sulphur or arsenic from ores, in a muffle.

3. <pharmacology> The roasting or drying of moist substances so as prepare them for pulverizing. The burning of wine.

4. Lascivious passion; concupiscence. "It is not certain that they took the better part when they chose ustulation before marriage, expressly against the apostle." (Jer. Taylor)

Origin: Cf. F. Ustulation.

(01 Mar 1998)

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