The Collaborative International Dictionary of English v.0.48:

Pig \Pig\, n. [Cf. D. big, bigge, LG. bigge, also Dan. pige
   girl, Sw. piga, Icel. p[imac]ka.]
   1. The young of swine, male or female; also, any swine; a
      hog. "Two pigges in a poke." --Chaucer.
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   2. (Zool.) Any wild species of the genus Sus and related
      genera.
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   3. [Cf. Sow a channel for melted iron.] An oblong mass of
      cast iron, lead, or other metal. See Mine pig, under
      Mine.
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   4. One who is hoggish; a greedy person. [Low]
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   Masked pig. (Zool.) See under Masked.

   Pig bed (Founding), the bed of sand in which the iron from
      a smelting furnace is cast into pigs.

   Pig iron, cast iron in pigs, or oblong blocks or bars, as
      it comes from the smelting furnace. See Pig, 4.

   Pig yoke (Naut.), a nickname for a quadrant or sextant.

   A pig in a poke (that is, bag), a blind bargain; something
      bought or bargained for, without the quality or the value
      being known. [Colloq.]
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WordNet (r) 3.0 (2006):

pig bed
    n 1: mold consisting of a bed of sand in which pig iron is cast
         [syn: pig bed, pig]