petroleum

noun

pe·​tro·​leum pə-ˈtrō-lē-əm How to pronounce petroleum (audio)
-ˈtrōl-yəm
: an oily flammable bituminous liquid that may vary from almost colorless to black, occurs in many places in the upper strata of the earth, is a complex mixture of hydrocarbons with small amounts of other substances, and is prepared for use as gasoline, naphtha, or other products by various refining processes

Examples of petroleum in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Jet fuel and diesel belong to the same group of refined petroleum products, known as middle distillates . Zev Fima,kevin Stankiewicz, CNBC, 5 July 2026 By waiving the legislation, foreign vessels could facilitate the transport of petroleum and fertilizer throughout the country’s ports, thus reducing potential supply disruptions that could further hike fuel prices. Glenn Taylor, Footwear News, 2 July 2026 Rwanda imports all its petroleum products overland through two ports, one in ​Dar es Salaam, Tanzania and the other in Mombasa, ⁠Kenya. Jenny Vaughan, semafor.com, 1 July 2026 Naphtha is a highly flammable petroleum product used in the production of fuels and other chemicals. ABC News, 30 June 2026 See All Example Sentences for petroleum

Word History

Etymology

Middle English, "mineral oil," borrowed from Medieval Latin, "mineral oil, crude oil," from Latin petra "rock" (borrowed from Greek pétra) + oleum "oil" — more at petro-, oil entry 1

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of petroleum was in the 15th century

Browse Nearby Words

Cite this Entry

“Petroleum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petroleum. Accessed 6 Jul. 2026.

Kids Definition

petroleum

noun
pe·​tro·​leum pə-ˈtrō-lē-əm How to pronounce petroleum (audio)
-ˈtrōl-yəm
: an oily flammable liquid that may vary from almost colorless to black, is obtained from wells drilled in the ground, and is the source of gasoline, kerosene, fuel oils, and other products

Medical Definition

petroleum

noun
: an oily flammable bituminous liquid that may vary from almost colorless to black, occurs in many places in the upper strata of the earth, is a complex mixture of hydrocarbons with small amounts of other substances, and is prepared for use as gasoline, naphtha, or other products by various refining processes

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