What is "luna cornea"

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.

n. (context chemistry obsolete English) horn silver, or fused silver chloride, a tough, brown, translucent mass