pyrosulfuric acid

noun
py·​ro·​sulfuric acid | \ "+...-\

Definition of pyrosulfuric acid

: an unstable, crystalline acid H2S2O7 that is usually handled commercially as a thick oily fuming liquid, that is formed by the union of sulfur trioxide with sulfuric acid, that is a chief component of fuming sulfuric acid, and that is converted to sulfuric acid when mixed with water

called also disulfuric acid

— compare oleum

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History and Etymology for pyrosulfuric acid

International Scientific Vocabulary pyr- + sulfuric

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