noctilucent [näk΄tə lo͞o′sənt]
shining in the night: said esp. of high-altitude clouds (75 to 90 km or 46 to 56 mi above the earth) that reflect twilight to the earth long after sunset or long before sunrise

English World dictionary. . 2014.

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  • noctilucent — adjective shining or glowing by night the noctilucent eyes of a cat • Similar to: ↑bright …   Useful english dictionary

  • Noctilucent cloud — Polar mesospheric cloud Noctilucent clouds over Kuresoo bog, Viljandimaa, Estonia Abbreviation NLC/PMC Altitude …   Wikipedia

  • noctilucent cloud — 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) …   New Collegiate Dictionary

  • noctilucent — noctilucence, n. /nok teuh looh seuhnt/, adj. Meteorol. (of high altitude clouds) visible during the short night of the summer. [1885 90; NOCTI + LUCENT] * * * …   Universalium

  • noctilucent — adjective Shining or glowing at night, especially of very high altitude clouds that reflect sunlight long after sunset …   Wiktionary

  • noctilucent — noc·ti·lu·cent …   English syllables

  • noctilucent — noc•ti•lu•cent [[t]ˌnɒk təˈlu sənt[/t]] adj. mer (of high altitude clouds) visible during the short night of the summer • Etymology: 1885–90; < Lnocti =noct , s. of nox night + i +lucent noc ti•lu′cence, n …   From formal English to slang

  • noctilucent — /nɒktəˈlusənt/ (say noktuh loohsuhnt) adjective 1. shining at night; phosphorescent. 2. Meteorology (of clouds) very high and cirrus like, visible during the short night of summer and believed to be of meteor dust shining with reflected sunlight …  

  • noctilucent cloud — ▪ meteorology       rare cloud form, probably composed of ice crystals and meteoric dust, that occurs at a higher altitude than any other cloud form (about 82 km [50 miles]). It is silvery or bluish white and is visible only on summer nights in… …   Universalium

  • noctilucent clouds — Clouds of unknown composition that occur at great heights, 45 to 55 miles (70–90 km). They resemble thin cirrus clouds but usually with a bluish or silverish color, although sometimes orange to red, standing out against a dark night sky. Also… …   Aviation dictionary

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