Where does “tra” come from?

tra (Albanian) comes from Latin trabem, from Latin trabs, from Indo-European *treb-.

tra (Albanian): beam

Definitions

Step	Language	Word	Meaning
1	Latin	trabem	accusative singular of trabs
2	Latin	trabs	timber, beam, rafter; tree trunk; penis
3	Indo-European	*treb-	—

tra — Etymology, Origin & Word History | Etymology Explorer