nacreous cloud

A highly layered cloud with an iri-descent appearance. It is akin to high-altitude cirrus clouds. Also called a mother-of-pearl cloud. Clouds of unknown composition, whose form resembles that of cirrus or altocumulus lenticularis. These clouds show very strong irisation, or iridescence, similar to that of the mother-of-pearl, especially when the sun is several degrees below the horizon. They occur at heights of about 12 to 18 miles (20–30 km).

Aviation dictionary. 2014.

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  • nacreous cloud — noun a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon • Syn: ↑mother of pearl cloud • Hypernyms: ↑cloud * * * noun : a luminous iridescent cloud that occurs at altitudes of about… …   Useful english dictionary

  • nacreous cloud — a rarely seen, luminous, iridescent cloud shaped like a cirrus or altocumulus, approximately 15 mi. (24 km) above the earth, and of unknown composition. Also called mother of pearl cloud. * * * …   Universalium

  • nacreous cloud — noun polar stratospheric cloud …   Wiktionary

  • nacreous cloud — /neɪkriəs ˈklaʊd/ (say naykreeuhs klown) noun cirrus cloud which is lit by the sun when it is several degrees below the horizon, resulting in an iridescent colouring …   Australian English dictionary

  • Cloud — For other uses, see Cloud (disambiguation). Cumulus cloudscape over Swifts Creek, Australia A cloud …   Wikipedia

  • Cloud atlas — For other uses, see Cloud atlas (disambiguation). A cloud atlas is a pictorial key to the nomenclature of clouds. Early cloud atlases were an important element in the training of meteorologists and in weather forecasting, and the author of a 1923 …   Wikipedia

  • Cloud condensation nuclei — Aerosol pollution over Northern India and Bangladesh NASA Cloud condensation nuclei or CCNs (also known as cloud seeds) are small particles typically 0.2 µm, or 1/100 th the size of a cloud droplet [1]) about which cloud droplets coalesce. Water… …   Wikipedia

  • mother-of-pearl cloud — noun a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon • Syn: ↑nacreous cloud • Hypernyms: ↑cloud * * * noun : nacreous cloud * * * mother of pearl cloud, = nacreous cloud. (Cf …   Useful english dictionary

  • polar stratospheric cloud — noun A relatively rare type of clouds that occurs high in the stratosphere; polar stratospheric clouds often resemble mother of pearl as they shine in vivid colours, known as irisation Syn: mother of pearl cloud, nacreous cloud …   Wiktionary

  • mother-of-pearl cloud. — See nacreous cloud. [1930 35] * * * …   Universalium

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