/ Dictionary / Index S sardius: Meaning and Definition of Find definitions for: sar•di•us Pronunciation: (sär'dē-us), [key] — n. sard. the precious stone, thought to have been a ruby, in the breastplate of the Jewish high priest. Ex. 28:17. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sardius (Thesaurus) Sardis sardonic Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language