|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|
|[C16: from Latin opalus, from Greek opallios, from Sanskrit upala precious stone]|
|a stew of meat, vegetables, potatoes, etc.|
|a fool or simpleton; ninny.|
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