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late 14c., from Anglo-French boras, from Medieval Latin baurach, from Arabic buraq, applied by the Arabs to various substances used as fluxes, probably from Persian burah. Originally obtained in Europe from the bed of salt lakes in Tibet.
borax bo·rax1 (bôr'āks', -əks)
: strictly a piece of borax junknoun
[1920s+ Furniture business; origin unknown; it has been suggested that sellers of cleansers based on the mineral borax gave away cheap furniture to customers]