na·​cre·​ous | \ ˈnā-krē-əs How to pronounce nacreous (audio) , -k(ə-)rəs \

Definition of nacreous

: possessing the qualities of, consisting of, or abounding in nacre also : iridescent

Examples of nacreous in a Sentence

the nacreous lining of the shell of a mollusk
Recent Examples on the Web Markov processes include an element of randomness—in this case, the thickness of the outermost nacreous layer—but one that can be influenced by the system’s history. Leila Sloman, Popular Mechanics, 28 Feb. 2022 An alternative explanation is that the red skies were the result of nacreous clouds common to that particular latitude. Jennifer Ouellette, Ars Technica, 21 May 2020 Also called polar stratospheric clouds (or less precisely, rainbow clouds), nacreous clouds normally only form in high latitudes and at extremely cold temperatures. National Geographic, 3 Feb. 2016 The cold air the storm blew in also led to the formation of beautiful nacreous clouds. National Geographic, 3 Feb. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nacreous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of nacreous

1819, in the meaning defined above

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The first known use of nacreous was in 1819

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Dictionary Entries Near nacreous



nacreous cloud

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Cite this Entry

“Nacreous.” Dictionary, Merriam-Webster, Accessed 29 May. 2022.

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More Definitions for nacreous


na·​cre·​ous | \ ˈnā-krē-əs How to pronounce nacreous (audio) , -k(ə-)rəs How to pronounce nacreous (audio) \

Medical Definition of nacreous

: having a pearly appearance nacreous bacterial colonies

More from Merriam-Webster on nacreous

Nglish: Translation of nacreous for Spanish Speakers


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