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 researchers fabricated ultrathin perovskite absorber layers measuring just 10 nanometers thick while still retaining useful photovoltaic performance.
—New Atlas, 26 May 2026
Scientists in Singapore have developed ultrathin solar cells that could one day turn car windows, skyscraper glass, and even smart glasses into power-generating surfaces.
—Aamir Khollam, Interesting Engineering, 14 May 2026
The startup Science has built an ultrathin, wireless microchip to replace the function of these photoreceptors.
—Bloomberg, Mercury News, 11 May 2026
Rather than an entry-level option, however, it was positioned as a more advanced, ultrathin device, costing more than the MacBook Air at the time.
—Luke Larsen, Wired News, 4 Mar. 2026
See All Example Sentences for ultrathin
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New Atlas, 26 May 2026
Scientists in Singapore have developed ultrathin solar cells that could one day turn car windows, skyscraper glass, and even smart glasses into power-generating surfaces.
—Aamir Khollam, Interesting Engineering, 14 May 2026
The startup Science has built an ultrathin, wireless microchip to replace the function of these photoreceptors.
—Bloomberg, Mercury News, 11 May 2026
Rather than an entry-level option, however, it was positioned as a more advanced, ultrathin device, costing more than the MacBook Air at the time.
—Luke Larsen, Wired News, 4 Mar. 2026
See All Example Sentences for ultrathin
Cite this Entry
“Ultrathin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultrathin. Accessed 31 May. 2026.
Copy CitationMedical Definition
ultrathin
adjective
ul·tra·thin
ˌəl-trə-ˈthin
: exceedingly thin
ultrathin sections for use in electron microscopy
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