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noctilucent cloud

Syllabification: (noc·ti·lu·cent cloud)
Pronunciation: /ˌnäktəˈlo͞osənt/

Definition of noctilucent cloud

noun

  • a high-altitude cloud that is luminous at night, especially in summer in high latitudes.

Origin:

late 19th century: from Latin nox, noct- 'night' + lucere 'to shine' + -ent

noctilucent cloud in other Oxford dictionaries

Definition of noctilucent cloud in the British & World English dictionary

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