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.]
   [1913 Webster]
   1. That in which metal is cast; a mold. [Obs.]
      [1913 Webster]

            And from the fire he took up his matter
            And in the ingot put it with merry cheer. --Chaucer.
      [1913 Webster]

   2. A bar or wedge of steel, gold, or other malleable metal,
      cast in a mold; a mass of unwrought cast metal.
      [1913 Webster]

            Wrought ingots from Besoara's mine.   --Sir W.
                                                  Jones.
      [1913 Webster]

   Ingot mold, a box or mold in which ingots are cast.

   Ingot iron. See Decarbonized steel, under Decarbonize.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ingot
    n 1: metal that is cast in the shape of a block for convenient
         handling [syn: ingot, metal bar, block of metal]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "ingot":
   bar, billet, bullion, button, cast, casting, coin gold,
   coin silver, copper, gate, gold, gold nugget, nickel, nugget, pig,
   precious metals, regulus, rod, sheet metal, silver, slab, sow,
   stick, strip, yellow stuff