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lunacy definition

lu·nacy (lo̵̅o̅′nə sē)

noun

    1. Obsolete intermittent insanity, formerly supposed to change in intensity with the phases of the moon
    2. mental unsoundness; insanity
  2. pl. lunacies -·cies great folly or a foolish act

Etymology: luna(tic) + -cy

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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