/ Dictionary / Index P peroxy: Meaning and Definition of Find definitions for: per•ox•y Pronunciation: (pu-rok'sē), [key] — adj. Chem. containing the peroxy group. peroxy- Pronunciation: [key] a combining form used in the names of chemical compounds in which the peroxy group is present: peroxyborate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peroxidize peroxyacid Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language