"rock oil" meaning in English

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  "etymology_text": "From rock + oil, a literal rendering of Latin petroleum (literally “rock oil”).",
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    {
      "form": "rock oils",
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        "plural"
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      "form": "rock-oil",
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      "glosses": [
        "Naphtha (liquid petroleum)."
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        "(dated) Naphtha (liquid petroleum)."
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        "(obsolete) Petroleum"
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  "word": "rock oil"
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      "form": "rock-oil",
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