groundhog

from WordNet (r) 3.0 (2006)

groundhog
    n 1: reddish brown North American marmot [syn: {groundhog},
         {woodchuck}, {Marmota monax}]

from The Collaborative International Dictionary of English v.0.48

groundhog \ground"hog`\, ground hog \ground" hog`\
   (ground"h[o^]g`), n.
   A reddish brown North American burrowing marmot ({Marmota
   monax}), also called the {woodchuck}. It hibernates in the
   winter.

   Syn: woodchuck, {Marmota monax}.
        [WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

marmot \mar"mot\ (m[aum]r"m[o^]t; 277), n. [It. marmotta,
   marmotto, prob. fr. L. mus montanus, or mus montis, lit.,
   mountain mouse or rat. See {Mountain}, and {Mouse}.]
   1. (Zool.) Any rodent of the genus {Marmota} (formerly
      {Arctomys}) of the subfamily Sciurinae. The common
      European marmot ({Marmota marmotta}) is about the size of
      a rabbit, and inhabits the higher regions of the Alps and
      Pyrenees. The {bobac} is another European species. The
      common American species ({Marmota monax}) is the
      {woodchuck} (also called {groundhog}), but the name marmot
      is usually used only for the western variety.
      [1913 Webster +PJC]

   2. Any one of several species of ground squirrels or gophers
      of the genus {Spermophilus}; also, the prairie dog.
      [1913 Webster]

   {Marmot squirrel} (Zool.), a ground squirrel or spermophile.
      

   {Prairie marmot}. See {Prairie dog}.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

40 Moby Thesaurus words for "groundhog":
      Cape polecat, ape, bar, bear, cavy, chimp, chimpanzee, coon,
      digger, dredge, dredger, driller, excavator, ferret, foumart,
      glutton, guinea pig, hedgehog, miner, monk, monkey, mousehound,
      navvy, opossum, polecat, porcupine, possum, prairie dog, quill pig,
      raccoon, sandhog, sapper, skunk, steam shovel, tunneler, weasel,
      whistle-pig, wolverine, woodchuck, zoril