noctilucent cloud - WordReference.com Dictionary of English

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- - noble metal
  - noble rot
  - noble savage
  - nobleman
  - noblesse
  - nobody
  - nociceptor
  - nock
  - noctambulist
  - noctiluca
  - noctilucent cloud
  - noctuid
  - noctule
  - nocturn
  - nocturnal
  - nocturnal emission
  - nocturne
  - nocuous
  - nod
  - noddle
  - noddy
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noctilucent cloud

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Concise Oxford English Dictionary © 2008 Oxford University Press:
noctilucent cloud /ˌnɒktɪˈluːs(ə)nt/

▶noun a high, luminous cloud seen at night, especially in summer in high latitudes.

– origin C19: from L. nox, noct- ‘night’ + lucere ‘to shine’ + -ent.

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