The Collaborative International Dictionary of English v.0.48:

Moonshine \Moon"shine`\, n.
   1. The light of the moon.
      [1913 Webster]

   2. Hence, show without substance or reality.
      [1913 Webster]

   3. A month. [R.] --Shak.
      [1913 Webster]

   4. A preparation of eggs for food. [Obs.]
      [1913 Webster]

   5. Liquor smuggled or illicitly distilled, especially liquor
      distilled illegally in rural parts of the southern U. S.
      [Dial. Eng., & Colloq. or Slang, U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Moonshine \Moon"shine`\, a.
   Moonlight. [R.] --Clarendon.
   [1913 Webster]

   2. Empty; trivial; idle.
      [Webster 1913 Suppl.]

   3. Designating, or pertaining to, illicit liquor; as,
      moonshine whisky. [Dial. Eng., & Colloq. or Slang, U. S.]
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

moonshine
    n 1: the light of the Moon; "moonlight is the smuggler's enemy";
         "the Moon was bright enough to read by" [syn: moonlight,
         moonshine, Moon]
    2: whiskey illegally distilled from a corn mash [syn:
       moonshine, bootleg, corn liquor]
    v 1: distill (alcohol) illegally; produce moonshine