Source : Webster's Revised Unabridged Dictionary (1913)

Luna \Lu"na\, n. [L.; akin to lucere to shine. See {Light}, n.,
   and cf. {Lune}.]
   1. The moon.

   2. (Alchemy) Silver.

   {Luna cornea} (Old Chem.), horn silver, or fused silver
      chloride, a tough, brown, translucent mass; -- so called
      from its resemblance to horn.

   {Luna moth} (Zo["o]l.), a very large and beautiful American
      moth ({Actias luna}). Its wings are delicate light green,
      with a stripe of purple along the front edge of the
      anterior wings, the other margins being edged with pale
      yellow. Each wing has a lunate spot surrounded by rings of
      light yellow, blue, and black. The caterpillar commonly
      feeds on the hickory, sassafras, and maple.

Source : WordNet®

Actias luna
     n : large pale-green American moth with long-tailed hind wings
         and a yellow crescent-shaped mark on each fore wing [syn:
          {luna moth}]