/ Dictionary / Index P precious opal: Meaning and Definition of Find definitions for: pre'cious o'pal Pronunciation: [key] any opal having a play of colors, used as a gemstone. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. precious moonstone precious stone 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