opalnoun [ C or U ]
uk/ˈəʊ.pəl/us/ˈoʊ.pəl/a precious stone whose colour changes when the position of the person looking at it changes
Thesaurus: synonyms and related words
Geology: precious & semi-precious stones
- amber
- amethyst
- carbuncle
- crystal
- cultured pearl
- diamond
- garnet
- gem
- jade
- jet
- jewel
- malachite
- marcasite
- onyx
- precious stone
- rock
- sapphire
- semiprecious
- stone
- topaz
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