/ Dictionary / Index S sodium perborate: Meaning and Definition of Find definitions for: so'dium perbo'rate Pronunciation: [key] — Chem. Chem. a white, crystalline, water-soluble solid, NaBO&multiplydot;3HO or NaBO&multiplydot;4HO, used chiefly as a bleaching agent and antiseptic. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sodium pentothal sodium peroxide Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language