Fum·ing, a. Producing fumes, or vapors.
 Cadet's fuming liquid Chem., alkarsin.
 Fuming liquor of Libavius Old Chem., stannic chloride; the chloride of tin, SnCl4, forming a colorless, mobile liquid which fumes in the air. Mixed with water it solidifies to the so-called butter of tin.
 Fuming sulphuric acid. Chem. Same as Disulphuric acid, uder Disulphuric.
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