The Collaborative International Dictionary of English v.0.48:

Julep \Ju"lep\ (j[=u]"l[e^]p), n. [F., fr. Sp. julepe, fr. Ar. &
   Per. jul[=a]b, jull[=a]b, fr. Per. gul[=a]b rose water and
   julep; gul rose + [=a]b water.]
   [1913 Webster]
   1. A refreshing drink flavored with aromatic herbs;
      especially (Med.), a sweet, demulcent, acidulous, or
      mucilaginous mixture, used as a vehicle. --Milton.
      [1913 Webster]

            Honey in woods, juleps in brooks.     --H. Vaughan.
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   2. An alcoholic beverage composed of brandy, whisky, or some
      other spirituous liquor, with sugar, pounded ice, and
      sprigs of mint; -- called also mint julep. [U.S.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mint \Mint\ (m[i^]nt), n. [AS. minte, fr. L. mentha, Gr. mi`nqa,
   mi`nqh.] (Bot.)
   The name of several aromatic labiate plants, mostly of the
   genus Mentha, yielding odoriferous essential oils by
   distillation. See Mentha.
   [1913 Webster]

   Note:

   Corn mint is Mentha arvensis.

   Horsemint is Mentha sylvestris, and in the United States
      Monarda punctata, which differs from the true mints in
      several respects.

   Mountain mint is any species of the related genus
      Pycnanthemum, common in North America.

   Peppermint is Mentha piperita.

   Spearmint is Mentha viridis.

   Water mint is Mentha aquatica.
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   Mint camphor. (Chem.) See Menthol.

   Mint julep. See Julep.

   Mint sauce, a sauce flavored with spearmint, for meats.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mint julep
    n 1: bourbon and sugar and mint over crushed ice [syn: julep,
         mint julep]