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lunatic

lu·na·tic / ˈloōnəˌtik/ • n. a mentally ill person (not in technical use). ∎  an extremely foolish or eccentric person: this lunatic just accelerated out of the side of the road. • adj. mentally ill (not in technical use). ∎  extremely foolish, eccentric, or absurd: he would be asked to acquiesce in some lunatic scheme. ORIGIN: Middle English: from Old French lunatique, from late Latin lunaticus, from Latin luna ‘moon’ (from the belief that changes of the moon caused intermittent insanity).

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lunatic

lunatic orig. affected with the kind of insanity that was supposed to depend on changes of the moon XIII; sb. XIV. — (O)F. lunatique — L. lūnāticus, f. lūna moon; see prec. -ATIC.
Hence lunacy XVI.

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"lunatic." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 21 Jun. 2018 <http://www.encyclopedia.com>.

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"lunatic." The Concise Oxford Dictionary of English Etymology. . Retrieved June 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/lunatic-1

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lunatic fringe

lu·na·tic fringe • n. an extreme or eccentric minority within society or a group.

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lunatic

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