[ soot, soot ]
See synonyms for soot on
  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)
  1. to mark, cover, or treat with soot.

Origin of soot

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

Other words from soot

  • sootless, adjective
  • sootlike, adjective

Words Nearby soot Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use soot in a sentence

British Dictionary definitions for soot


/ (sʊt) /

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

  1. (tr) to cover with soot

Origin of soot

Old English sōt; related to Old Norse, Middle Low German sōt, Lithuanian sódis, Old Slavonic sažda, Old Irish sūide

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

Scientific definitions for soot


[ sut ]

  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.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.