The Collaborative International Dictionary of English v.0.48:

Grapevine \Grape"vine`\, n. (Bot.)
   A vine or climbing shrub, of the genus Vitis, having small
   green flowers and lobed leaves, and bearing the fruit called
   grapes.
   [1913 Webster]

   Note: The common grapevine of the Old World is Vitis
         vinifera, and is a native of Central Asia. Another
         variety is that yielding small seedless grapes commonly
         called Zante currants. The northern Fox grape of
         the United States is the V. Labrusca, from which, by
         cultivation, has come the Isabella variety. The
         southern Fox grape, or Muscadine, is the V.
         vulpina. The Frost grape is V. cordifolia, which
         has very fragrant flowers, and ripens after the early
         frosts.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Muscadine \Mus"ca*dine\, n. [See Muscadel.]
   1. (Bot.) A name given to several very different kinds of
      grapes, but in America used chiefly for the scuppernong,
      or southern fox grape, which is said to be the parent
      stock of the Catawba. See Grapevine.
      [1913 Webster]

   2. (Bot.) A fragrant and delicious pear.
      [1913 Webster]

   3. (Zool.) See Muscardin.
      [1913 Webster]

   Northern muscadine (Bot.), a derivative of the northern fox
      grape, and scarcely an improvement upon it.

   Royal muscadine (Bot.), a European grape of great value.
      Its berries are large, round, and of a pale amber color.
      Called also golden chasselas.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Muscardin \Mus"car*din\, n. [F., fr. muscadin a musk-scented
   lozenge, fr. muscade nutmeg, fr. L. muscus musk. See
   Muscadel.] (Zool.)
   The common European dormouse; -- so named from its odor.
   [Written also muscadine.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

muscadine
    n 1: native grape of southeastern United States; origin of many
         cultivated varieties [syn: muscadine, Vitis
         rotundifolia]
    2: dull-purple grape of southern United States [syn:
       muscadine, bullace grape]