Old English sōt, from Proto-Germanic *sōtą (“soot”), a derivation of *sitjaną (whence also English sit). Cognate with Old Norse sót, Old Dutch soet and Middle Low German sōt. Compare similar ō-grade formation from the Proto-Indo-European *sed- (“sit”) in Old Irish suide (“soot”) and Balto-Slavic: Lithuanian súodžiai (“soot”), and Proto-Slavic *sadja (“soot”) (Russian са́жа (sáža), Polish and Slovak sadza, Bulgarian са́жда (sážda)).
- Fine black or dull brown particles of amorphous carbon and tar, produced by the incomplete combustion of coal, oil etc.
See also 
- (transitive) To cover or dress with soot.
- to soot land
- (Can we find and add a quotation of Mortimer to this entry?)