The Collaborative International Dictionary of English v.0.48:

Pig \Pig\, n.
   A piggin. [Written also pigg.]
   [1913 Webster]

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.
      [1913 Webster]

   2. (Zool.) Any wild species of the genus Sus and related
      genera.
      [1913 Webster]

   3. [Cf. Sow a channel for melted iron.] An oblong mass of
      cast iron, lead, or other metal. See Mine pig, under
      Mine.
      [1913 Webster]

   4. One who is hoggish; a greedy person. [Low]
      [1913 Webster]

   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.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pig \Pig\, v. t. & i. [imp. & p. p. Pigged; p. pr. & vb. n.
   Pigging.]
   1. To bring forth (pigs); to bring forth in the manner of
      pigs; to farrow.
      [1913 Webster]

   2. To huddle or lie together like pigs, in one bed.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pig
    n 1: domestic swine [syn: hog, pig, grunter, squealer,
         Sus scrofa]
    2: a coarse obnoxious person [syn: slob, sloven, pig,
       slovenly person]
    3: a person regarded as greedy and pig-like [syn: hog, pig]
    4: uncomplimentary terms for a policeman [syn: bull, cop,
       copper, fuzz, pig]
    5: mold consisting of a bed of sand in which pig iron is cast
       [syn: pig bed, pig]
    6: a crude block of metal (lead or iron) poured from a smelting
       furnace
    v 1: live like a pig, in squalor [syn: pig, pig it]
    2: eat greedily; "he devoured three sandwiches" [syn: devour,
       guttle, raven, pig]
    3: give birth; "sows farrow" [syn: farrow, pig]

The Devil's Dictionary (1881-1906):

PIG, n.  An animal (_Porcus omnivorus_) closely allied to the human
race by the splendor and vivacity of its appetite, which, however, is
inferior in scope, for it sticks at pig.