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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Spie·gel i·ron  Metal. A fusible white cast iron containing a large amount of carbon (from three and a half to six per cent) and some manganese. When the manganese reaches twenty-five per cent and upwards it has a granular structure, and constitutes the alloy ferro manganese, largely used in the manufacture of Bessemer steel. Called also specular pig iron, spiegel, and spiegeleisen.
 

From: WordNet (r) 2.0

 spiegel iron
      n : pig iron containing manganese; used as a deoxidizing agent
          and to raise the manganese content in making steel [syn:
          spiegeleisen, spiegel]