/ Dictionary / Index S silica glass: Meaning and Definition of Find definitions for: sil'ica glass" Pronunciation: [key] glass made entirely from silica, having a very low rate of thermal expansion. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. silica gel silicate Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language