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Synonyms

soot

American  
[soot, soot] / sʊt, sut /

noun

  1. a black, carbonaceous substance produced during incomplete combustion of coal, wood, oil, etc., rising in fine particles and adhering to the sides of the chimney or pipe conveying the smoke: also conveyed in the atmosphere to other locations.


verb (used with object)

  • soots,
    present (3rd person singular)
  • sooted,
    past participle,  past
  • sooting
    present participle
  1. to mark, cover, or treat with soot.

soot British  
/ sʊt /

noun

  1. finely divided carbon deposited from flames during the incomplete combustion of organic substances such as coal

"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

verb

  1. (tr) to cover with soot

"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
soot Scientific  
/ st /
  1. A black, powdery substance that consists mainly of carbon and is formed through the incomplete combustion of wood, coal, diesel oil, or other materials. Because it absorbs energy from sunlight rather than reflecting it, soot is believed to be a cause of global warming, especially when it settles on snow and ice, reducing their reflectivity. Soot particles in the air are a contributing factor in respiratory diseases.


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Etymology

Origin of soot

before 900; Middle English; Old English sōt; cognate with Old Norse sōt

Explanation

The powdery black stuff that's sometimes created when fuel burns is called soot. A chimney sweep's job is to clean all the soot and ash from inside a chimney. Soot is mostly made of carbon, and it forms when matter burns incompletely. Engines, burning coal, and house fires are all sources of soot, and soot is a major contributor to air pollution around the world. It's dangerous for people to breathe too much soot into their lungs. Soot comes from a Germanic root that literally means "what settles."

Keep Reading on Vocabulary.com

Vocabulary lists containing soot

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.

See Examples For:

"When we see something very red in the universe, we often assume that it is surrounded by dust, like soot or ash," Simcoe explains.

From Science Daily Aug. 13, 2026

Rescuers and workers, some wearing hard hats but most in everyday attire, helped carry bodies out of the concrete tunnel, some covered in black soot.

From Barron's Jul. 31, 2026

The fire sent plumes of black smoke over Boyle Heights and other parts of Los Angeles, leaving the air heavy with soot.

From Los Angeles Times Jul. 12, 2026

Emitted near the ground, soot is a short-lived warming agent.

From The Wall Street Journal Jun. 11, 2026

Only then did Alex notice that Nunu was right: their dad was covered in soot and grime.

From "Eleven" by Tom Rogers

Last year in Ramadan he imposed midnight curfew on coffeehouses and other soots where revelers congregated until dawn.

From Time Magazine Archive

You would hardly think that all those substances which fly about London in the form of soots and blacks are the very beauty and life of the flame.

From The World's Greatest Books — Volume 15 — Science by Sir John Alexander Hammerton

Although I've hate or nine new soots of close, and Mr. Cullin fits me heligant, yet I fansy they hall reckonise me.

From Burlesques by William Makepeace Thackeray

Yet though starved by the exhausted soil, and clogged by soots from innumerable chimneys, it remained majestic, finely decorative as some tree of metal, of age-old bronze roughened by a greenness of deep-eating rust.

From The Far Horizon by Lucas Malet

He looks big; he paints himself histrionically; he soots his face; he has a masterful dog, nothing half so fearful as a wolf-dog or bloodhound; and he raises his own manes, poor, stridulous Struldbrugs.

From The Posthumous Works of Thomas De Quincey, Vol. 1 by Alexander H. (Alexander Hay) Japp

His design touch is about to turn the sooted, shut-down BlackHorn into Shelby Jean’s, which will soon be giving off warm and comfy vibes as a restaurant and pub.

From Washington Times Mar. 21, 2015

Squinting in the glare, 1,727 contestants sooted their sights with candles, tightened their slings, commenced firing at 5:50 a. m. over glistening grass.

From Time Magazine Archive

Some thought it was the edge of a huge and newly invented Nazi smoke screen blown in from the front, for London and the southeast British coast were also sooted.

From Time Magazine Archive

By the time we arrived there the snow had become drab and sooted, wet and heavy.

From "A Separate Peace" by John Knowles

He looked at her sharply from under his sooted brows.

From Saint Martin's Summer by Rafael Sabatini

The offensive production from Morant came on 12 of 19 sooting from the field and marked the ninth time in the past 10 games the All-Star guard reached the 30-point mark.

From Seattle Times Feb. 8, 2022

After that all had gone well—except for a plug sooting on number three cylinder and a halt for petrol about fifty miles outside London.

From Men of Affairs by Roland Pertwee

The night-watchman, Alfred Swanson, took care of this curious plant, which consisted of a battery of petroleum lamps that were forced to burn to the sooting point.

From Edison, His Life and Inventions by Frank Lewis Dyer

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