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.
In the oil market, crude prices sank roughly 2% on expectations that more petroleum could be set to flow into global markets because of a possible deal between the United States and Iran over that country’s nuclear program. Stan Choe, Los Angeles Times, 15 May 2025 When the industry picked up in the 1960s, with rare earths being used as catalysts for refining petroleum and in TV sets, the US had a fortuitous head start. Mark Dent, HubSpot, 9 May 2025 More than 90% of paved roads in the U.S. are made of asphalt, which is constructed with nonrenewable materials such as petroleum. Baoshan Huang, The Conversation, 8 May 2025 Shale producers, and particularly their petroleum engineers, might not cooperate. Michael Lynch, Forbes.com, 5 May 2025 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

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Cite this Entry

“Petroleum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petroleum. Accessed 21 May. 2025.

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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