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.
Your kindred shuns your house
As beaten hence by your strange lunacy.
Shak.
2. A morbid suspension of good sense or
judgment, as through fanaticism. Dr. H. More.
Syn. -- Derangement; craziness; mania. See
Insanity.