- nacreous cloud as a noun:
- 1
nacreous cloud
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.
synonym: mother-of-pearl cloud.
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noun
A luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon.
synonym: mother-of-pearl cloud.
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