/ Dictionary / Index S silica gel: Meaning and Definition of Find definitions for: sil'ica gel" Pronunciation: [key] — Chem. Chem. a highly adsorbent gelatinous form of silica, used chiefly as a dehumidifying and dehydrating agent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. silica silica glass 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