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petroleum

American  
[puh-troh-lee-uhm] / pəˈtroʊ li əm /

noun

  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.

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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.

Other Word Forms

  • petroleous adjective

Etymology

Origin of petroleum

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

Compare meaning

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The moves are a side effect of the war with Iran, which has spread across more of the Middle East, creating tighter supplies of oil and petroleum products such as jet fuel.

From The Wall Street Journal • Apr. 1, 2026

And on Monday, it’s possible that the national average price reaches $4 a gallon, according to Patrick De Haan, head of petroleum analysis at GasBuddy.

From MarketWatch • Mar. 28, 2026

An association representing petroleum outlets in the country has cited high demand for fuel because of panic buying, with stock levels running low.

From BBC • Mar. 26, 2026

He cited Texas-based petroleum companies Murphy Oil and Apache Oil, a subsidiary of APA, as firms that have already established international footholds.

From Barron's • Mar. 26, 2026

Gone are the big petroleum companies and the forests of derricks as the vast oil fields have been increasingly depleted.

From "Killers of the Flower Moon" by David Grann

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.