| opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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| opalesce | (verb) exhibit a play of colors like that of an opal | - |
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| (verb) reflect light or colors like an opal | - |
| opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opalise | (verb) replace or convert into opal | Synonyms: opalize |
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| (verb) make opalescent | Synonyms: opalize |
| opalize | (verb) replace or convert into opal | Synonyms: opalise |
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| (verb) make opalescent | Synonyms: opalise |