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From The Collaborative International Dictionary of English v.0.48:
Luna \Lu"na\, n. [L.; akin to lucere to shine. See Light, n., and cf. Lune.] 1. The moon. [1913 Webster] 2. (Alchemy) Silver. [1913 Webster] Luna cornea (Old Chem.), horn silver, or fused silver chloride, a tough, brown, translucent mass; -- so called from its resemblance to horn. Luna moth (Zool.), 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. [1913 Webster]