/ Dictionary / Index P peroxymonosulfuric acid: Meaning and Definition of Find definitions for: per•ox'y•mon'o•sul•fu'ric ac'id Pronunciation: (pu-rok'sē-mon'ō-sul-fyoor'ik, -rok"sē-mon"-), [key] — Chem. Chem. See(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peroxy group peroxysulfuric acid Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language