Definition of soot noun from the Oxford Advanced Learner's Dictionary

 

soot

 noun
noun
BrE BrE//sʊt//
 
; NAmE NAmE//sʊt//
 
[uncountable] Waste and pollution
 
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black powder that is produced when wood, coal, etc. is burnt see also sooty The fireplace was blackened with soot. a cloud of smoke and soot Her face was streaked with soot. See related entries: Waste and pollution Word Origin Old English sōt, of Germanic origin; related to German dialect Sott, from an Indo-European root shared by the verb sit.
See the Oxford Advanced American Dictionary entry: soot