ultracold
adjective
ul·tra·cold
ˌəl-trə-ˈkōld 
: having a very low temperature : extremely or extraordinarily cold
ultracold liquid nitrogen
ultracold temperatures
Examples of ultracold in a Sentence
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The biggest challenge is that the property was observed at ultracold temperatures of about 60 kelvins (-351 °F/-213 °C).
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Abhimanyu Ghoshal, New Atlas, 13 June 2025
The number of ultracold atoms in the resulting Bose-Einstein condensate was measured and fed back to the player as a score.
—Ottó Elíasson, IEEE Spectrum, 22 Oct. 2019
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
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Abhimanyu Ghoshal, New Atlas, 13 June 2025
The number of ultracold atoms in the resulting Bose-Einstein condensate was measured and fed back to the player as a score.
—Ottó Elíasson, IEEE Spectrum, 22 Oct. 2019
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
See All Example Sentences for ultracold
Cite this Entry
“Ultracold.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultracold. Accessed 21 Jul. 2025.
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