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单词 deuterium
释义

WordReference Random House Unabridged Dictionary of American English © 2024
deu•te•ri•um  (do̅o̅ tēr′ē əm, dyo̅o̅-),USA pronunciation n. [Chem.]
  1. Chemistryan isotope of hydrogen, having twice the mass of ordinary hydrogen;
    heavy hydrogen. Symbol: D;
    at. wt.: 2.01;
    at. no.: 1.
  • Greek deúter(os) second (see deutero-) + -ium
  • 1933

Collins Concise English Dictionary © HarperCollins Publishers::
deuterium /djuːˈtɪərɪəm/ n
  1. a stable isotope of hydrogen, occurring in natural hydrogen (156 parts per million) and in heavy water: used as a tracer in chemistry and biology. Symbol: D or ²H; atomic no: 1; atomic wt: 2.014; boiling pt: –249.7°C
Etymology: 20th Century: New Latin; see deutero-, -ium; from the fact that it is the second heaviest hydrogen isotope
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