ul·tra·cold
| \ ˌəl-trə-ˈkōld
\
\
Definition of ultracold
: having a very low temperature : extremely or extraordinarily cold
ultracold liquid nitrogen ultracold temperatures
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“Ultracold.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultracold. Accessed 2 Oct. 2022.
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Time Traveler for ultracold
The first known use of ultracold was in 1861
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