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.
      [1913 Webster]

   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]

WordNet (r) 3.0 (2006):

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