Etymology
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borax (n.)

late 14c., name given to several useful minerals, specifically to a salt formed from the union of boracic acid and soda, 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 beds of salt lakes in Tibet. Related: Boracic.

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Definitions of borax

borax (n.)
an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent;
From wordnet.princeton.edu