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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