of or pertaining to nacre.
resembling nacre; lustrous; pearly.

1830–40; nacre + -ous

subnacreous, adjective
unnacreous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nacreous (ˈneɪkrɪəs)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

nacreous na·cre·ous (nā'krē-əs)
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.
The interior of the shell has a border of dark blue to violet surrounding the pearly white nacreous layer.
Other balloons will carry instruments to study the role of nacreous clouds in ozone depletion.
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