| nacreous cloud n. A 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).] |
nacreous cloud (n  kr - s) A cloud resembling a cirrus, showing iridescent coloration when the Sun is several degrees below the horizon. These clouds appear mostly during winter in regions of high latitude. |
ThesaurusLegend: Synonyms Related Words Antonyms
| 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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