luna : Idioms & Phrases

• noun large pale-green American moth with long-tailed hind wings and a yellow crescent-shaped mark on each forewing
  Actias luna.
  

WordNet

• (Old Chem.), horn silver, or fused silver chloride, a tough, brown, translucent mass; so called from its resemblance to horn.

Webster 1913

• noun large pale-green American moth with long-tailed hind wings and a yellow crescent-shaped mark on each forewing
  Actias luna.
  

WordNet

• (Zoöl.), 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.

Webster 1913