USTULA'TION, noun [Latin ustulatus.] 1. The act of burning or searing. 2. In metallurgy, ustulation is the operation of expelling one substance from another by heat, as sulphur and arsenic from ores, in a muffle. 3. In pharmacy, the roasting or drying of moist substances so as to prepare them for pulverizing; also, the burning of wine.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI