noctilucent cloud


noc·ti·lu·cent cloud

noun \ˌnäk-tə-ˈlü-sənt-\

Definition of NOCTILUCENT CLOUD

:  a luminous thin usually colored cloud seen especially at twilight at a height of about 50 miles (80 kilometers)

Origin of NOCTILUCENT CLOUD

noctilucent ultimately from Latin noct- + lucent-, lucens lucent
First Known Use: 1910

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