| NOUN | object | nacreous cloud, mother-of-pearl cloud | a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon |
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| Meaning | A luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon. | |
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| Synonym | mother-of-pearl cloud | |
| Broader | cloud | A visible mass of water or ice particles suspended at a considerable altitude |
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