A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface.

plural of petroleum

One of 56 counties in Montana, United States. County seat: Winnett.

A substance, mostly carbon, that is a byproduct of oil refining; used as a fuel or in many industrial applications.

A pale yellow semisolid mixture of hydrocarbons obtained from petroleum; used in lubricants and ointments.

Helaeomyia petrolei, a Californian fly whose larvae feed on dead insects that become trapped in naturally occurring petroleum pools.

plural of petroleum fly

plural of petroleum coke

petroleum ether

petroleum ether / plural of petroleum spirit