noun

• (entomology) A luna moth: a member of species Actias luna.
  "“Gee,” whispered Oliver. He sat there staring. “A luna! I never thought I’d see a real luna!”"
• (Christianity, chiefly Catholicism and Anglicanism) A lunette: a crescent-shaped receptacle, often glass, for holding the (consecrated) host (the bread of communion) upright when exposed in the monstrance.
  "The Bread of Angels is first taken from the tabernacle, where it rests in the luna, and placed upon the altar, covered with a corporal. After genuflecting, the priest puts the luna containing the Blessed Sacrament on its throne—the monstrance—and elevates it […]"

noun

• (Hawaii) A foreman on a plantation.
  "There are several reasons why the Hawaiian-born Japanese boys and girls do not take kindly to plantation labor, but one of the chief reasons is the objection to the kind of lunas who oversee the work of the laborers."

name

• (Roman mythology) The sister of Aurora and Sol; the goddess of the moon; equivalent to the Greek Selene.
• (chiefly science fiction or poetic) The name of Earth's moon; Moon.
  "Luna that ne'er shines by day."

noun

• (heraldry, rare) Argent (silver), in the postmedieval practice of blazoning the tinctures of certain sovereigns' (especially British monarchs') coats as planets.
  "4. Luna, a Mantle of Estate, Mars doubled Ermine, ouched Sol, garnished with Strings fastned thereunto fretways dependent, and tasselled of the same. [...] These Arms do belong to the Town of Beckbock in Wales."
• (obsolete, alchemy, chemistry) Silver.