Noctilucent definitions

nŏk'tə-lo͝o'sənt
Luminous at night. Used especially of certain high clouds.
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Shining in the night.
adjective
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Luminous at night. The term is used especially to describe certain high atmospheric cloud formations visible during summer nights at high latitudes.
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(meteorology) Shining or glowing at night, especially of very high-altitude clouds that reflect sunlight long after sunset.
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