ALL meanings of fuming sulfuric acid
fume sul·fu·ric ac·id
F f - noun fuming sulfuric acid an oily, hygroscopic, corrosive liquid, H 2 S 2 O 7 , that, depending on purity, is colorless or dark brown: used chiefly as a dehydrating agent in the manufacture of explosives and as a sulfating or sulfonating agent in the manufacture of dyes. 1