Proto-Indo-European *drew-

→ English trow (derived)

→ English sheltron (derived)

→ Old English treg (derived)

→ Catalan dur (mention)

→ French dur (mention)

→ Ancient Greek δροόν (mention)

→ Latin durus (mention)

→ Norwegian Bokmål tre (mention)

→ Norwegian Bokmål abildtre (mention)

→ Norman dû (mention)

→ Occitan dur (mention)

→ Portuguese durante (mention)

→ Sanskrit द्रु (inherited)

→ Sanskrit दर्वी (mention)

→ Sanskrit दर्वि (mention)

→ Albanian drënjë (derived)

→ Swedish tröst (mention)