subs. (old).See quots.
1609. DEKKER, Lanthorne and Candlelight, viii. A MOONMAN signifies in English a mad-man By a by-name they are called Gipsies, they call themselves Egiptians, others in mockery call them MOON-MEN.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v.
1785. GROSE, A Classical Dictionary of the Vulgar Tongue, s.v. MOON-MEN. Gypsies.
1811. GROSE and CLARKE, Lexicon Balatronicum, s.v.
3. (old).A nocturnal robber. Also MINIONS OF THE MOON.
1597. SHAKESPEARE, 1 Henry IV., i. 2. The fortune of us that are MOONS MEN doth ebb and flow like the sea.