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2 definitions found
 for Borax
From The Collaborative International Dictionary of English v.0.48 :

  Borax \Bo"rax\, n. [OE. boras, fr. F. borax, earlier spelt
     borras; cf. LL. borax, Sp. borraj; all fr. Ar. b?rag, fr.
     Pers. b?rah.]
     A white or gray crystalline salt, with a slight alkaline
     taste, used as a flux, in soldering metals, making enamels,
     fixing colors on porcelain, and as a soap. It occurs native
     in certain mineral springs, and is made from the boric acid
     of hot springs in Tuscany. It was originally obtained from a
     lake in Thibet, and was sent to Europe under the name of
     tincal. Borax is a pyroborate or tetraborate of sodium,
     Na2B4O7.10H2O.
     [1913 Webster]
  
     Borax bead. (Chem.) See Bead, n., 3.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  borax
      n 1: an ore of boron consisting of hydrated sodium borate; used
           as a flux or cleansing agent

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