Definisi dalam bahasa Inggris
opal
/'/oU/p/@/l /noun (n)
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a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones (noun.substance)
Sumber: wordnet30
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A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. (noun)
Sumber: webster1913