adjective Meteorology.
(of high-altitude clouds) visible during the short night of the summer.

1885–90; nocti- + lucent

noctilucence, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
noctilucent (ˌnɒktɪˈluːsənt)
shining at night, usu. of very thin high altitude clouds observable in the summer twilight sky

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
noctilucent   (nŏk'tə-l'sənt)  Pronunciation Key 
Luminous at night. The term is used especially to describe certain high atmospheric cloud formations visible during summer nights at high latitudes.
The American Heritage® Science Dictionary
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