Source : Webster's Revised Unabridged Dictionary (1913)

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}.

   2. (Bot.) A fragrant and delicious pear.

   3. (Zo["o]l.) See {Muscardin}.

   {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}.

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}.

   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.

Source : WordNet®

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