Soot
/sˈʊt/
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Definition
(noun) Fine black or dull brown particles of amorphous carbon and tar, produced by the incomplete combustion of coal, oil etc.
Sentence Examples
It's carbon or soot.
He wasn't crying. He just got soot in his eyes.
CEFR Practice Quiz
The chimney sweep had to remove a large buildup of black ____ to prevent a potential fire hazard.