Welsh traws

← Breton treuz (cognate)

← Proto-Brythonic *trans (inherited)

← Proto-Celtic *trānss (inherited)

← Proto-Indo-European *terh₂- (inherited)

← Latin trāns (cognate)

← Old Irish tar (cognate)

→ Welsh trosedd (affix)

→ Welsh trosi (suffix)

→ Welsh trawslin (affix)

→ Welsh lletraws (affix)