ul·​tra·​thin ˌəl-trə-ˈthin How to pronounce ultrathin (audio)
: 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

Examples of ultrathin in a Sentence

a new generation of flat-panel TVs that were ultrathin
Recent Examples on the Web Wrap the ultrathin scarf tightly around your neck from the front to the back, then back to the front, and let the long ends hang loose. Jana Ackermann, Glamour, 5 Apr. 2024 By harnessing light, my colleagues and I designed a wireless, ultrathin pacemaker that operates like a solar panel. Pengju Li, Discover Magazine, 23 Mar. 2024 However, previous research has shown that some ultrathin 2D materials could present a workaround, doubling performance compared with that of bulk 3D thermoelectric materials. IEEE Spectrum, 18 Jan. 2024 But mostly, the scientists hope to use the ultrathin imaging device to study fatty plaques in the blood vessels and take images of aneurysms. Courtney Linder, Popular Mechanics, 30 July 2020 Now a team of researchers have found a way to use coal to create ultrathin insulating films that could help launch a new era of semiconductors made with 2D materials. IEEE Spectrum, 24 Jan. 2024 Others have previously made stretchable circuits by depositing ultrathin layers of metal in weblike networks or serpentine patterns. IEEE Spectrum, 30 Nov. 2022 The Australian team uses ultrathin needles to inject embryos of the Aedes aegypti mosquito, the main carrier of the dengue virus, with the Wolbachia bacterium, an innocuous microbe present in 70 percent of all insect species. Linda Marsa, Discover Magazine, 4 Jan. 2012 The detector is essentially a pendulum—a molybdenum ring hanging on an ultrathin tungsten fiber—that feels the gravitational tug of two rotating molybdenum disks below. Steve Nadis, Discover Magazine, 26 July 2012

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ultrathin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1851, in the meaning defined above

Time Traveler
The first known use of ultrathin was in 1851

Dictionary Entries Near ultrathin

Cite this Entry

“Ultrathin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultrathin. Accessed 13 Jul. 2024.

Medical Definition


ul·​tra·​thin ˌəl-trə-ˈthin How to pronounce ultrathin (audio)
: exceedingly thin
ultrathin sections for use in electron microscopy
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