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]

Moby Thesaurus II by Grady Ward, 1.0:

398 Moby Thesaurus words for "pig":
   Angora goat, Arctic fox, Belgian hare, Caffre cat, Dogberry,
   Indian buffalo, John Law, Kodiak bear, Virginia deer, aardvark,
   aardwolf, alpaca, animal, anteater, antelope, antelope chipmunk,
   aoudad, apar, armadillo, ass, aurochs, bacon, badger, bandicoot,
   barrow, bassarisk, bat, bear, beast, beaver, belly-god, bettong,
   bicycle, bigot, bike, binturong, bison, black bear, black buck,
   black cat, black fox, black sheep, blue fox, bluecoat, boar, bobby,
   bobcat, brown bear, brush deer, brush wolf, buffalo, buffalo wolf,
   bull, bullion, burro, burro deer, butt, button, cachalot, camel,
   camelopard, capybara, carabao, caribou, carpincho, cast, casting,
   cat, cat-a-mountain, catamount, cattalo, cavy, chamois, chauvinist,
   cheetah, chevrotain, chinchilla, chipmunk, chitterlings, chopper,
   cinnamon bear, cochon de lait, coon, coon cat, cop, copper,
   cormorant, cotton mouse, cotton rat, cougar, cow, coyote, coypu,
   cracklings, cur, cycle, cyprian, deer, deer tiger, dick, dingo,
   doctrinaire, dog, dogmatist, donkey, dormouse, drab, dromedary,
   echidna, eland, elephant, elk, ermine, eyra, fallow deer, fanatic,
   fat back, ferret, field mouse, fisher, fitch, flatfoot, flattie,
   flitch, flying phalanger, foumart, fox, fox squirrel, frump, fuzz,
   gammon, gate, gazelle, gemsbok, gendarme, genet, gilt, giraffe,
   glutton, gnu, gnu goat, goat, goat antelope, gopher, gorger,
   gormand, gormandizer, gourmand, gourmandizer, greedy eater,
   greedygut, greedyguts, grizzly bear, ground squirrel, groundhog,
   guanaco, guinea pig, gumshoe, guttler, ham, ham steak, hamster,
   hare, harnessed antelope, hartebeest, haslet, headcheese, heat,
   hedgehog, hippopotamus, hog, horse, hound, husky eater, hussy,
   hyena, hyrax, ibex, illiberal, ingot, insect, intolerant, iron,
   jackal, jackass, jackrabbit, jade, jaguar, jaguarundi, jambon,
   jambonneau, jerboa, jerboa kangaroo, jezebel, jingo, kaama,
   kangaroo, kangaroo mouse, kangaroo rat, karakul, kinkajou, kit fox,
   koala, lapin, lard, lemming, leopard, leopard cat, lion, litterbug,
   llama, lynx, male chauvinist, mammoth, man, mara, marmot, marten,
   mastodon, meerkat, minibike, mink, mole, mongoose, mongrel, moose,
   motocycle, motorbike, motorcycle, mouflon, mountain goat,
   mountain lion, mountain sheep, mouse, mule, mule deer, muntjac,
   musk deer, musk hog, musk-ox, muskrat, musquash, nab, nilgai,
   nutria, ocelot, okapi, onager, oont, opossum, otter, ounce, ox,
   pack rat, paddy, painter, panda, pangolin, panther, peccary,
   pedicab, peeler, peludo, phalanger, picnic ham, pieds de cochon,
   piggy, piglet, pigling, pine mouse, platypus, pocket gopher,
   pocket mouse, pocket rat, polar bear, polar fox, polecat,
   porcupine, pork, porker, porkpie, possum, pouched rat, poyou,
   prairie dog, prairie wolf, pronghorn, puma, rabbit, raccoon,
   racist, rat, razorback, red deer, red squirrel, regulus, reindeer,
   reptile, rhinoceros, road-bike, roe, roe deer, roebuck, sable,
   salt pork, schlep, schlump, serpent, serval, sexist, shamus, sheep,
   sheet metal, shoat, shrew, shrew mole, side of bacon, sika,
   silver fox, skunk, slattern, slob, sloppy Joe, sloth, sloven, slut,
   small ham, snake, snowshoe rabbit, sow, sowbelly, springbok,
   squirrel, stoat, strumpet, suckling pig, superpatriot, suslik,
   swamp rabbit, swine, takin, tamandua, tamarin, tapir, tarpan,
   tatou, tatou peba, tatouay, the cops, the fuzz, the law, tiger,
   tiger cat, timber wolf, trail bike, tramp, tree shrew, trencherman,
   trencherwoman, tricycle, trike, trollop, trotters, trull, tusker,
   ultranationalist, urus, varmint, vermin, viper, vole, wallaby,
   warthog, water buffalo, waterbuck, weasel, wharf rat, wheel, whelp,
   whistler, white fox, wild ass, wild boar, wild goat, wild ox,
   wildcat, wildebeest, wolf, wolverine, wombat, wood rat, woodchuck,
   woolly mammoth, worm, yak, zebra, zebu, zoril



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PIG
       Psion Interest Group (Psion)


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.