/ Dictionary / Index S silicon dioxide: Meaning and Definition of Find definitions for: sil'icon diox'ide Pronunciation: [key] — Chem. Chem. silica. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. silicon carbide silicone Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language