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Collins English-English Dictionary
- opal ['əυpəl]
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1.
n
an amorphous, usually iridescent, mineral that can be of almost any colour, found in igneous rocks and around hot springs. It is used as a gemstone. Composition: hydrated silica. Formula: SiO2.nH2O
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2.
n
[Etymology]
C16: from Latin opalus, from Greek opallios, from Sanskrit upala precious stone
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1.
n
an amorphous, usually iridescent, mineral that can be of almost any colour, found in igneous rocks and around hot springs. It is used as a gemstone. Composition: hydrated silica. Formula: SiO2.nH2O
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