/ Dictionary / Index S Silures: Meaning and Definition of Find definitions for: Sil•u•res Pronunciation: (sil'yu-rēz"), [key] — n.pl. a British Celtic tribe resident in southeastern Wales at the time of the Roman conquest of Britain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. siltstone Silurian Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language