Etymology tree Proto-Italic *wre- Latin re-der. Esperanto re- Proto-Indo-European *h₃erdʰ- Proto-Italic *arðōs Old Latin arbos Latin arbor Latin -em Latin arborem Old French arbre French arbrebor. Esperanto arbo Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -ārius Latin -ariumder. ▲ Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Gothic -𐌰𐍂𐌴𐌹𐍃 (-areis)bor. Proto-Slavic *-ařь…