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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Origin and Etymology of pyrosulfuric acid

International Scientific Vocabulary pyr- + sulfuric


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