petroleum

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[edit] English

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[edit] Etymology

From Middle English petroleum from petra (rock) + oleum (oil).

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[edit] Noun

Singular
petroleum

Plural
petroleums or, rarely, petrolea

petroleum (plural petroleums or, rarely, petrolea)

  1. 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.

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