GNU Collaborative International Dictionary of English

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1.       
   Duralumin prop. n. [a trademark.] an aluminum-based alloy which is both light and strong, containing 4 per cent of copper and 0.5 per cent of magnesium and smaller amounts of iron, manganese, and silicon.  It hardens with aging at room temperature.
   
   [WordNet 1.5 +PJC]