What does "moon" mean?

Additional senses

1. 2.The time occupied by the moon in making one revolution in her orbit; a month. Shak.
2. 3.(Fort.) A crescentlike outwork. See Half-moon. Moon blindness. (a) (Far.) A kind of ophthalmia liable to recur at intervals of three or four weeks. (b) (Med.) Hemeralopia. -- Moon dial, a dial used to indicate time by moonlight. -- Moon face, a round face like a full moon. -- Moon madness, lunacy. [Poetic] -- Moon month, a lunar month. -- Moon trefoil (Bot.), a shrubby species of medic (Medicago arborea). See Medic. -- Moon year, a lunar year, consisting of lunar months, being sometimes twelve and sometimes thirteen.
3. 4.To expose to the rays of the moon. If they have it to be exceeding white indeed, they seethe it yet once more, after it hath been thus sunned and mooned. Holland.
4. 5.To act if moonstruck; to wander or gaze about in an abstracted manner. Elsley was mooning down the river by himself. C. Kingsley.