/ Dictionary / Index S sunstone: Meaning and Definition of Find definitions for: sun•stone Pronunciation: (sun'stōn"), [key] — n. a reddish variety of oligoclase feldspar, used as a gem, having a red and bright-yellow play of color. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sunstone (Thesaurus) sun star sunstroke 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