Definition of borax noun from the Oxford Advanced Learner's Dictionary

 

borax

 noun
noun
BrE BrE//ˈbɔːræks//
 
; NAmE NAmE//ˈbɔːræks//
 
[uncountable]
 
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a white mineral, usually in powder form, used in making glass and as an antiseptic (= a substance that helps to prevent infection in wounds) Word Origin late Middle English: from medieval Latin, from Arabic būraq, from Pahlavi (a language used in an area controlled by Persia for about 400 years until 651 AD) būrak.
See the Oxford Advanced American Dictionary entry: borax