petroleum

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petroleum(crude oil) Naturally occurring liquid hydrocarbons formed by the anaerobic decay of organic matter. Oil is rarely found at its original site of formation but migrates to a suitable structural or lithological trap. Petroleum is frequently associated with salt water and with gaseous hydrocarbons. See also natural gas and oil shale.

petroleum

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petroleum mineral oil, occurring in rocks, etc. XVI. — medL., f. L. petra rock (see PETRIFY) + oleum OIL.

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petroleum

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