na·cre·ous

[ney-kree-uhs]
adjective
1.
of or pertaining to nacre.
2.
resembling nacre; lustrous; pearly.

Origin:
1830–40; nacre + -ous

sub·na·cre·ous, adjective
un·na·cre·ous, adjective
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World English Dictionary
nacreous (ˈneɪkrɪəs) [Click for IPA pronunciation guide]
 
adj
1.  relating to or consisting of mother-of-pearl
2.  having the lustre of mother-of-pearl: nacreous minerals

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Nacreous is always a great word to know.
So is quincunx. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
American Heritage
Medical Dictionary

nacreous na·cre·ous (nā'krē-əs)
adj.
Resembling mother-of-pearl; lustrous.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These clouds are known as nacreous and noctilucent clouds respectively.
Other balloons will carry instruments to study the role of nacreous clouds in ozone depletion.
The interior of the shell has a border of dark blue to violet surrounding the pearly white nacreous layer.
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