Etymology
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luna (n.)

late 14c. "the moon," especially as personified in a Roman goddess answering to Greek Selene; also an alchemical name for "silver;" from Latin luna "moon, goddess of the moon," from PIE *leuksna- (source also of Old Church Slavonic luna "moon," Old Prussian lauxnos "stars," Middle Irish luan "light, moon"), suffixed form of root *leuk- "light, brightness." The luna moth (1841, American English) so called for the crescent-shaped eye-spots on its wings.

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Definitions of luna

Luna (n.)
(Roman mythology) the goddess of the Moon; counterpart of Greek Selene;
From wordnet.princeton.edu