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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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|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 horizon|
cloud - a visible mass of water or ice particles suspended at a considerable altitude
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