nacreous cloud, mother-of-pearl cloud(noun)
a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
polar stratospheric cloud
The numerical value of nacreous cloud in Chaldean Numerology is: 1
The numerical value of nacreous cloud in Pythagorean Numerology is: 7
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"nacreous cloud." Definitions.net. STANDS4 LLC, 2017. Web. 21 Oct. 2017. <http://www.definitions.net/definition/nacreous cloud>.