Webster's English Dictionary

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soot

1. soot \'su.t, 's*t, 'su:t\ n [ME, fr. OE so-t; akin to OIr su-ide soot, 
   OE sittan to] sit : a black substance formed by combustion, rising in fine 
   particles, and ad hering to the sides of the chimney or pipe conveying the 
   smoke; esp : the fine powder consisting chiefly of carbon that colors smoke
2. soot vt : to coat or cover with soot