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nacreous cloud
nacreous cloudn. A stratospheric cloud resembling a cirrus, showing iridescent coloration when the sun is several degrees below the horizon.
[From nacre (from the iridescent coloring of mother-of-pearl).]Thesaurus| Noun | 1. | nacreous cloud - a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizonmother-of-pearl cloudcloud - a visible mass of water or ice particles suspended at a considerable altitude |
nacreous cloud
nacreous cloudA highly layered cloud with an iridescent 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).nacreous cloud
Related to nacreous cloud: Noctilucent cloud, Polar stratospheric cloudSynonyms for nacreous cloudnoun a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizonSynonymsRelated Words |