|—n , pl -raxes, -races|
|1.||Also called: tincal a soluble readily fusible white mineral consisting of impure hydrated disodium tetraborate in monoclinic crystalline form, occurring in alkaline soils and salt deposits. Formula: Na2B4O7.10H2O|
|2.||pure disodium tetraborate|
|[C14: from Old French boras, from Medieval Latin borax, from Arabic būraq, from Persian būrah]|
borax bo·rax1 (bôr'āks', -əks)
|borax (bôr'āks') Pronunciation Key
A white, crystalline powder and mineral used as an antiseptic, as a cleansing agent, and in fusing metals and making heat-resistant glass. The mineral is an ore of boron and also occurs in yellowish, blue, or green varieties. Chemical formula: Na2B4O7·10H2O.