\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.