borax
bo.rax \'bo-(*)r-.aks, 'bo.(*)r-. -*ks\ n [ME boras, fr. MF, fr. ML borac-, borax, fr. Ar bu-raq)X, fr. Per bu-rah : a hydrated sodium borate Na2B4O7.10H2O used esp. as a flux, cleansing agent, and water softener and as a preservative
Webster's English Dictionarybo.rax \'bo-(*)r-.aks, 'bo.(*)r-. -*ks\ n [ME boras, fr. MF, fr. ML borac-, borax, fr. Ar bu-raq)X, fr. Per bu-rah : a hydrated sodium borate Na2B4O7.10H2O used esp. as a flux, cleansing agent, and water softener and as a preservative