▪ Engl borax, lC14, from Anglo-Fr boras, from mLat baurach, from Ar būraq, applied by the Arabs to various substances used as fluxes, probably from Pers būrah. Originally obtained in Europe from the bed of salt lakes in Tibet – EtymOnline. ▪ Lokotsch1927#356: Ar būraq > Span borraj, Port borax, Fr borax, It borrace; Du Engl borax, Ge Borax; Ru Bulg bura, Serb Pol boraks, Cz borax.