ultracold

adjective

ul·​tra·​cold ˌəl-trə-ˈkōld How to pronounce ultracold (audio)
: having a very low temperature : extremely or extraordinarily cold
ultracold liquid nitrogen
ultracold temperatures

Examples of ultracold in a Sentence

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Its infrared sensors, its ultracold location in space, and its sunshield — which blocks the light of the sun, moon and Earth — are uniquely suited to resolve the first galaxies and their stars. Rebecca Boyle, Quanta Magazine, 9 Oct. 2024 Their experiments involved shooting photons through a cloud of ultracold rubidium atoms and measuring the resulting degree of atomic excitation. Manon Bischoff, Scientific American, 30 Sep. 2024 The most precise and accurate atomic clock in the world, the ultracold strontium clock at JILA in Boulder, is like a stopwatch that can count the billionths of a nanosecond, or 18 digits past the decimal point. Allison Parshall, Scientific American, 11 Sep. 2024 But for now, shipment and long-term preservation still require ultracold temperatures, posing logistical challenges in some countries. Nicole Lurie, Foreign Affairs, 23 Dec. 2021 See all Example Sentences for ultracold 

Word History

First Known Use

1861, in the meaning defined above

Time Traveler
The first known use of ultracold was in 1861

Dictionary Entries Near ultracold

Cite this Entry

“Ultracold.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultracold. Accessed 3 Dec. 2024.

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