/ Dictionary / Index P pyrosulfate: Meaning and Definition of Find definitions for: py•ro•sul•fate Pronunciation: (pī"ru-sul'fāt), [key] — n. Chem. a salt of pyrosulfuric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pyrostat pyrosulfuric Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language