ultracold

adjective
ul·​tra·​cold | \ ˌəl-trə-ˈkōld How to pronounce ultracold (audio) \

Definition of ultracold

: having a very low temperature : extremely or extraordinarily cold ultracold liquid nitrogen ultracold temperatures

First Known Use of ultracold

1861, in the meaning defined above

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The first known use of ultracold was in 1861

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