Polish torf

← German Torf (borrowed)

← Proto-Germanic *turbz (derived)

← Middle Low German torf (derived)

← Proto-Indo-European *derbʰ- (root)

← Proto-Indo-European *derbʰ- (derived)

← Old Saxon turf (derived)

← Old Saxon *torf (mention)

→ Esperanto torfo (borrowed)

→ Polish torfowisko (suffix)