from
The Collaborative International Dictionary of English v.0.48
Lunacy \Lu"na*cy\, n.; pl. {Lunacies}. [See {Lunatic}.]
1. Insanity or madness; properly, the kind of insanity which
is broken by intervals of reason, -- formerly supposed to
be influenced by the changes of the moon; any form of
unsoundness of mind, except idiocy; mental derangement or
alienation. --Brande. --Burrill.
[1913 Webster]
Your kindred shuns your house
As beaten hence by your strange lunacy. --Shak.
[1913 Webster]
2. A morbid suspension of good sense or judgment, as through
fanaticism. --Dr. H. More.
Syn: Derangement; craziness; mania. See {Insanity}.
[1913 Webster]