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py'rosulfu'ric ac'id

an oily, hygroscopic, corrosive liquid, H2S2O7, 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. Also called fuming sulfuric acid, oleum.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.



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