ultrathin
adjective
ul·tra·thin
ˌəl-trə-ˈthin 
: extremely or extraordinarily thin
ultrathin phones
ultrathin fashion models
The molecules ride on the surface like a film of soap and assemble themselves into an ultrathin layer about one-millionth of an inch thick.—
Mike May
Mike MayExamples of ultrathin in a Sentence
a new generation of flat-panel TVs that were ultrathin
Recent Examples on the Web
The system relies on two sets of Fresnel lenses, flat ultrathin structures similar to those in lighthouses.
—Aamir Khollam, Interesting Engineering, 8 Sep. 2025
And an all-new model, which is expected to be called the iPhone 17 Air, will have an ultrathin body.
—Bloomberg, Mercury News, 5 Sep. 2025
Composed of 100 or more layers of ultrathin film produced in the vacuum tank, the silvery pieces are abstract but reveal a tinge of figuration.
—Julie Belcove, Robb Report, 31 Aug. 2025
In research described in Nature Nanotechnology, Jiong Lu and his colleagues at National University of Singapore and in China developed a technique that can grow a 200-millimeter sheet of a new kind of ultrathin carbon material in just 3 seconds, with no detectable impurities.
—IEEE Spectrum, 18 Aug. 2025
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Aamir Khollam, Interesting Engineering, 8 Sep. 2025
And an all-new model, which is expected to be called the iPhone 17 Air, will have an ultrathin body.
—Bloomberg, Mercury News, 5 Sep. 2025
Composed of 100 or more layers of ultrathin film produced in the vacuum tank, the silvery pieces are abstract but reveal a tinge of figuration.
—Julie Belcove, Robb Report, 31 Aug. 2025
In research described in Nature Nanotechnology, Jiong Lu and his colleagues at National University of Singapore and in China developed a technique that can grow a 200-millimeter sheet of a new kind of ultrathin carbon material in just 3 seconds, with no detectable impurities.
—IEEE Spectrum, 18 Aug. 2025
See All Example Sentences for ultrathin
Cite this Entry
“Ultrathin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultrathin. Accessed 18 Sep. 2025.
Copy CitationMedical Definition
ultrathin
adjective
ul·tra·thin
ˌəl-trə-ˈthin
: exceedingly thin
ultrathin sections for use in electron microscopy
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