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The Adobe Flash Player is required in order to view this content. You can get it here: noctilucent cloudOne entry found. Main Entry: noc·ti·lu·cent cloud Pronunciation: \ˌnäk-tə-ˈlü-sənt-\ Function: noun Etymology: noctilucent ultimately from Latin noct- + lucent-, lucens lucent Date: 1910 : a luminous thin usually colored cloud seen especially at twilight at a height of about 50 miles (80 kilometers) 
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