Breadcrumb Home > Dictionary > Index S silex: Meaning and Definition of Find definitions for: si•lex Pronunciation: (sī'leks), [key] — n. flint; silica. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: silex (Thesaurus) silesia silhouette ✖ Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language