Marmota monax

from WordNet (r) 3.0 (2006)

Marmota monax
    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]