The Collaborative International Dictionary of English v.0.48:

Ingot \In"got\, n. [Prob. from AS. in in + ge['o]tan to pour:
   cf. F. linglot, LL. lingotus a mass of gold or silver,
   extended in the manner of a tongue, and G. einguss, LG. & OE.
   ingot ingot, a mold for casting metals in. See Found to
   cast, and cf. Linget, Lingot, Nugget.]
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   1. That in which metal is cast; a mold. [Obs.]
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            And from the fire he took up his matter
            And in the ingot put it with merry cheer. --Chaucer.
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   2. A bar or wedge of steel, gold, or other malleable metal,
      cast in a mold; a mass of unwrought cast metal.
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            Wrought ingots from Besoara's mine.   --Sir W.
                                                  Jones.
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   Ingot mold, a box or mold in which ingots are cast.

   Ingot iron. See Decarbonized steel, under Decarbonize.
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WordNet (r) 3.0 (2006):

ingot iron
    n 1: iron of high purity