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
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The sleek, ultrathin rim makes these everyday glasses anything but ordinary.
—Blake Bakkila, Architectural Digest, 17 June 2025
To make the tattoos, the researchers grow one or two layers of graphene on copper foil, coat it with an ultrathin 200-nanometer-thick layer of acrylic, and transfer it to commercial temporary tattoo paper.
—IEEE Spectrum, 29 June 2022
These stamps include a variety of ultrathin unpackaged electronics, flexible circuits, and sensitive dyes.
—IEEE Spectrum, 29 May 2015
The ultrathin blade made of Japanese carbon steel won't get discolored as easily as others, but the lack of information regarding the hardness of its blade gives me pause as to its performance in the long term.
—Molly Higgins, Wired News, 2 May 2025
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Blake Bakkila, Architectural Digest, 17 June 2025
To make the tattoos, the researchers grow one or two layers of graphene on copper foil, coat it with an ultrathin 200-nanometer-thick layer of acrylic, and transfer it to commercial temporary tattoo paper.
—IEEE Spectrum, 29 June 2022
These stamps include a variety of ultrathin unpackaged electronics, flexible circuits, and sensitive dyes.
—IEEE Spectrum, 29 May 2015
The ultrathin blade made of Japanese carbon steel won't get discolored as easily as others, but the lack of information regarding the hardness of its blade gives me pause as to its performance in the long term.
—Molly Higgins, Wired News, 2 May 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 24 Jul. 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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