单词	ultracold
释义	ultracold adjective ul·​tra·​cold ˌəl-trə-ˈkōld  : having a very low temperature : extremely or extraordinarily cold ultracold liquid nitrogen ultracold temperatures Word History First Known Use 1861, in the meaning defined above ultracold adjective as in cryogenic Synonyms & Similar Words Relevance cryogenic subzero freezing subfreezing icy cold arctic polar frigid frosty glacial chilly shivery ice-cold wintry cool chill numbing coolish bone-chilling gelid nippy wintery coldish cooled frozen penetrating bitter nipping algid chilled piercing unheated invigorating refrigerated cutting iced crisp rigorous snappy bracing brisk frosted keen sharp Antonyms & Near Antonyms hot boiling molten igneous warming sweltering heated fiery sizzling broiling seething burning sultry searing warm scorching roasting scalding torrid blazing fervid lukewarm glowing ardent fervent tepid warmed reheated piping hot white-hot overheated ultrahot toasty red-hot tropical feverish inflamed equatorial muggy snug steamy summery flushed enflamed canicular See More
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