petroleum

American  

[puh-troh-lee-uhm] / pəˈtroʊ li əm /

noun

• petroleums
  plural

1. an oily, thick, flammable, usually dark-colored liquid that is a form of bitumen or a mixture of various hydrocarbons, occurring naturally in various parts of the world and commonly obtained by drilling: used in a natural or refined state as fuel, or separated by distillation into gasoline, naphtha, benzene, kerosene, paraffin, etc.

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petroleum British  

/ pəˈtrəʊlɪəm /

noun

1. a dark-coloured thick flammable crude oil occurring in sedimentary rocks around the Persian Gulf, in parts of North and South America, and below the North Sea, consisting mainly of hydrocarbons. Fractional distillation separates the crude oil into petrol, paraffin, diesel oil, lubricating oil, etc. Fuel oil, paraffin wax, asphalt, and carbon black are extracted from the residue

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petroleum Scientific  

/ pə-trō′lē-əm /

1. A thick, flammable, yellow-to-black mixture of gaseous, liquid, and solid hydrocarbons that occurs naturally beneath the Earth's surface. It can be separated into fractions including natural gas, gasoline, naphtha, kerosene, paraffin wax, asphalt, and fuel and lubricating oils, and is used as raw material for a wide variety of derivative products. It is believed to originate from the accumulated remains of fossil plants and animals, especially in shallow marine environments.

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Other Word Forms

Derived Forms

• petroleous
  adjective

Inflected Forms

Nouns

• petroleums
  plural

Etymology

Origin of petroleum

1520–30; < Medieval Latin: literally, rock oil, equivalent to Latin petr ( a ) rock (< Greek pétra ) + oleum oil

Compare meaning

How does petroleum compare to similar and commonly confused words? Explore the most common comparisons:

• petrolatum vs. petroleum

Explanation

Petroleum is oil — a fossil fuel that powers many vehicles and other machinery. Petroleum is a fancy, technical word for something you've probably heard of: oil, an energy source. Petroleum is also known as crude, crude oil, fossil oil, and rock oil. A lot of petroleum is found in the Middle East, and people are always looking for new sources of petroleum. You have to drill for petroleum, because it's deep inside the Earth. There’s a limited amount of petroleum, so many people worry that we're going to use it all up.

Example Sentences

See Examples For:

petroleum petroleums

Excluding energy and petroleum, producer prices were up 0.8% from the month before after falling 0.6% in July, the national data agency said.

From The Wall Street Journal ● Sep. 17, 2026

Its strategic petroleum reserves hold only 9-10 days of net oil imports, compared with roughly 200 days in Japan and 207 in South Korea.

From BBC ● Sep. 17, 2026

The monthly rise in the industrial product price index for August was driven by energy and petroleum products, including a jump in diesel fuel and in light fuel oils.

From The Wall Street Journal ● Sep. 17, 2026

The combined cost of gas and diesel is now $700 million higher per day compared to a year ago, Patrick De Haan, Gas Buddy’s head of petroleum analysis, said Thursday on X.

From MarketWatch ● Sep. 10, 2026

The most frequently repeated messages will be station call signals and appeals to purchase detergents, deodorants, headache tablets, and automobile and petroleum products.

From "Cosmos" by Carl Sagan

The method was carried out as above with four samples of American petroleums, Colorado oil from Florence, Col.;

From Scientific American Supplement, No. 711, August 17, 1889 by Various

At present little is known as to how far many of the very cheap distillates and crude petroleums can be used as fuel for internal-combustion engines.

From Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 by Herbert M. Wilson

Zaloziecki found, according to this method, in three samples of Galician petroleums, 4.6, 5.8 and 6.5 per cent., respectively, of proto-paraffine.

From Scientific American Supplement, No. 711, August 17, 1889 by Various

By extension, any one of the natural hydrocarbons, including the hard, solid, brittle varieties called asphalt, the semisolid maltha and mineral tars, the oily petroleums, and even the light, volatile naphthas.

From Webster's Unabridged Dictionary (2nd 100 Pages) by Noah Webster

Related Words

• crude oil
• fossil fuel
• fuel
• gas
• gasoline
• kerosene
• natural gas
• petrol