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Middle English from Medieval Latin petrōleum Latin petra rock petrous Latin ōleum oil oil
American Heritage Dictionary of the English Language, 5th Edition
From Medieval Latin petroleum, from petra (“rock") + oleum (“oil").
Petroleum and natural gas also occur in the plateau rocks in great quantities.
Petroleum was collected for use in the most remote ages of which we have any records.
Petroleum is the most widely used fossil fuel.
Some petroleum was obtained in the S.E.
Petroleum, also known as crude oil, is used for generating electricity and for manufacturing.
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