Where does “дёрн” come from?

дёрн (Russian) comes from Proto-Slavic dьrnъ, from Proto-Slavic dьrati, from Proto-Indo-European der- — to split, to separate; to tear, to crack, to...

дёрн (Russian): turf, sod, divot

Definitions

turf, sod, divot

Ancestry of “дёрн”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	dьrnъ	piece, chunk; toft, sod
2	Proto-Slavic	dьrati	to tear, to flay
3	Proto-Indo-European	der-	to split, to separate; to tear, to crack, to...

Every word from Proto-Indo-European der- →Every word from Proto-Slavic dьrati →Every word from Proto-Slavic dьrnъ →