| Definitions | | petroleum |
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noun (pl=petroleums or, rarely, petrolea)
- A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under earth surface.
Etymology: From Latin, petroleum < (petrelaion) "oil of the rock" < Ancient Greek (petra) "stone, rock" + (elaion) "olive oil, any oily substance".
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Full Definition of petroleum
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