- sùith
- soot, Irish súithche, Middle Irish suithe, Old Irish suidi, fuligine, Welsh huddugl (cf. hudd, dark), Breton huzel (French suie): *sodio-, root sed, sit, settle; English soot, Anglo-Saxon sót, Norse sót. Doubtful.
Etymological dictionary of the Gaelic language. Alexander Gairm Publications. 1982.