/ Dictionary / Index P precious moonstone: Meaning and Definition of Find definitions for: pre'cious moon'stone Pronunciation: [key] moonstone (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. precious metal precious opal Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language