nacreous cloud


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Related to nacreous cloud: Noctilucent cloud, Polar stratospheric cloud

nacreous cloud

n.
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).]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nacreous cloud - a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
cloud - a visible mass of water or ice particles suspended at a considerable altitude