/ Dictionary / Index S semiprecious: Meaning and Definition of Find definitions for: sem•i•pre•cious Pronunciation: (sem"ē-presh'us, sem"ī-), [key] — adj. (of a stone) having commercial value as a gem but not classified as precious, as the amethyst or garnet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: semiprecious (Thesaurus) semipostal semiprivate Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language