nacreous
adjective
na·cre·ous
ˈnā-krē-əs 
-k(ə-)rəs
-k(ə-)rəs
: 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
Tiffany has a long-standing history with pearls, both nacreous—from oysters and mollusks—and non-nacreous, like Melo Melo pearls.
—
Stellene Volandes, Town & Country, 20 Feb. 2021
Unfortunately, nacreous clouds also support chemical reactions that convert benign chlorine-containing molecules into a form that destroys Earth’s ozone layer.
—Rebecca Coffey, Discover Magazine, 29 Jan. 2012
Quahogs produce non-nacreous, porcelainlike pearls, according to the Gemological Institute of America.
—Shannon Marvel McNaught, USA TODAY, 16 Aug. 2022
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
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Stellene Volandes, Town & Country, 20 Feb. 2021
Unfortunately, nacreous clouds also support chemical reactions that convert benign chlorine-containing molecules into a form that destroys Earth’s ozone layer.
—Rebecca Coffey, Discover Magazine, 29 Jan. 2012
Quahogs produce non-nacreous, porcelainlike pearls, according to the Gemological Institute of America.
—Shannon Marvel McNaught, USA TODAY, 16 Aug. 2022
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
Cite this Entry
“Nacreous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nacreous. Accessed 12 Jul. 2025.
Copy CitationMedical Definition
nacreous
adjective
na·cre·ous
ˈnā-krē-əs
-k(ə-)rəs
-k(ə-)rəs
: having a pearly appearance
nacreous bacterial colonies
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