Where does “*slānos” come from?

*slānos (Proto-Celtic) comes from Proto-Indo-European sōlh₂- — mercy, comfort; comfort, mercy.

Ancestry of “*slānos”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	sōlh₂-	mercy, comfort; comfort, mercy

*slānos — Etymology, Origin & Word History | Etymology Explorer