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单词	promethium
释义	promethium noun pro·​me·​thi·​um prə-ˈmē-thē-əm  : a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium see Chemical Elements Table Example Sentences Recent Examples on the Web One promethium isotope, with eighty-eight neutrons, has a half-life of a few days; the other, with eighty-six neutrons, has a half-life of a few years. Neima Jahromi, The New Yorker, 27 Dec. 2019 Word History Etymology New Latin, from Latin Prometheus First Known Use 1948, in the meaning defined above Medical Definition promethium noun pro·​me·​thi·​um prə-ˈmē-thē-əm  : a radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium —symbol Pm see Chemical Elements Table
随便看	numbs numbskull numbskulls numdah numdahs numen numenii Numenius numeniuses numens numerable numeracies numeracy numeral numerally numerals numerate numerated numerates numerating numeration numerations numerative numerator numerators

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