lunacy - WordReference.com Dictionary of English

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- - lump
  - lump sum
  - lumpectomy
  - lumpen
  - lumpenproletariat
  - lumpfish
  - lumpish
  - lumpsucker
  - lumpy
  - luna moth
  - lunacy
  - lunar
  - lunar cycle
  - lunar day
  - lunar distance
  - lunar eclipse
  - lunar month
  - lunar node
  - lunar observation
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  - lunate
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lunacy

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Concise Oxford English Dictionary © 2008 Oxford University Press:
lunacy/ˈluːnəsi/

▶noun (pl. lunacies) insanity (not in technical use).

■ extreme folly.

– origin C16 from lunatic + -acy.

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