Old Irish druimm

← Proto-Celtic *drosman (inherited)

← English tram (cognate)

← Proto-Germanic *þrumą (cognate)

← Proto-Indo-European *térmn̥ (derived)

← Latin dorsum (cognate)

→ Irish droim (inherited)

→ Scottish Gaelic druim (inherited)

→ Manx dreeym (inherited)

→ Latin dorsum (cognate)