Noctilucence

noctilucent

[nok-tuh-loo-suhnt]
adjective Meteorology.
(of high-altitude clouds) visible during the short night of the summer.

Origin:
1885–90; nocti- + lucent

noctilucence, noun
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Collins
World English Dictionary
noctilucent (ˌnɒktɪˈluːsənt)
 
adj
shining at night, usu. of very thin high altitude clouds observable in the summer twilight sky
 
nocti'lucence
 
n

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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