/ 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: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language