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[loo-nuh-see] /ˈlu nə si/

noun, plural lunacies.
insanity; mental disorder.
intermittent insanity, formerly believed to be related to phases of the moon.
extreme foolishness or an instance of it:
Her decision to resign was sheer lunacy.
unsoundness of mind sufficient to incapacitate one for civil transactions: a former legal term.
noun (pl) -cies
(formerly) any severe mental illness
foolishness or a foolish act

1540s, “condition of being a lunatic,” formed in English from lunatic + -cy. Originally in reference to intermittent periods of insanity, such as were believed to be triggered by the moon’s cycle. The Old English equivalent was monaðseocnes “month-sickness.”


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  • Lunar

    [loo-ner] /ˈlu nər/ adjective 1. of or relating to the moon: the lunar orbit. 2. measured by the moon’s revolutions: a lunar month. 3. resembling the moon; round or crescent-shaped. 4. of or relating to silver. noun 5. a lunar observation taken for purposes of navigation or mapping. /ˈluːnə/ adjective 1. of or relating to […]

  • Lunar-cycle

    noun 1. .

  • Lunar-caustic

    noun, Medicine/Medical, Chemistry. 1. silver nitrate, AgNO 3 , especially in a sticklike mold, used to cauterize tissues. noun 1. silver nitrate fused into sticks, which were formerly used in cauterizing

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