noctilucent cloud

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noun noc·ti·lu·cent cloud \ ˌnäk-tə-ˈlü-sᵊnt- \
Updated on: 11 Sep 2017

Definition of noctilucent cloud

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

Origin and Etymology of noctilucent cloud

noctilucent "luminous in the dark," from Latin noct-, nox 1night + -i- -i- + lucent


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