noun Chemistry.
a salt of pyrosulfuric acid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
pyrosulfate   (pī'rō-sŭl'fāt')  Pronunciation Key 
A salt or ester of pyrosulfuric acid, containing the group S2O7.
The American Heritage® Science Dictionary
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