\ ˈsu̇t How to pronounce soot (audio) , ˈsət, ˈsüt How to pronounce soot (audio) \

Definition of soot

 (Entry 1 of 2)

: a black substance formed by combustion or separated from fuel during combustion, rising in fine particles, and adhering to the sides of the chimney or pipe conveying the smoke especially : the fine powder consisting chiefly of carbon that colors smoke


sooted; sooting; soots

Definition of soot (Entry 2 of 2)

transitive verb

: to coat or cover with soot

Examples of soot in a Sentence

Recent Examples on the Web: Noun Flaring emits planet-warming greenhouse gases, as well as soot, into the atmosphere. New York Times, 10 May 2022 In addition to the carbon footprint reduction based on the fuel change (~40%), these engines would generate much lower smog and 100 times less soot. Steven Savage, Forbes, 30 Apr. 2022 Overall, the report finds that 2.1 million more Americans live in counties with unhealthy air compared with last year’s report, and exposure to deadly soot has gotten worse. Doyle Rice, USA TODAY, 21 Apr. 2022 Diesel particulate filters capture and store exhaust soot, in order to reduce emissions and have been fitted to cars for almost 20 years. Jamie Hailstone, Forbes, 14 Mar. 2022 Iceland and Finland have led another project to develop and share technologies designed to reduce black carbon, or soot. Los Angeles Times, 7 Mar. 2022 People got used to the noise, and those who lived near the power plant—less than half a mile from downtown—resigned themselves to frequently scrubbing soot from their windows and sills. Elizabeth Royte, Smithsonian Magazine, 29 Mar. 2022 Yet, the Soviet Union’s chemical engineers knew their craft, and some clearly were unhappy to see the fruits of decades of labor reduced to incinerator soot, Gilbert said. Washington Post, 16 Mar. 2022 The metal siding from her home was warped and covered in a layer of soot. Washington Post, 19 Mar. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'soot.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of soot


before the 12th century, in the meaning defined above


1602, in the meaning defined above

History and Etymology for soot


Middle English, from Old English sōt; akin to Old Irish suide soot, Old English sittan to sit

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The first known use of soot was before the 12th century

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Dictionary Entries Near soot



soot blowing

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Last Updated

18 May 2022

Cite this Entry

“Soot.” Dictionary, Merriam-Webster, Accessed 24 May. 2022.

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More Definitions for soot


\ ˈsu̇t How to pronounce soot (audio) , ˈsət \

Kids Definition of soot

: a black powder formed when something is burned : the very fine powder that colors smoke


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