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deuterium

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/djuːˈtɪərɪəm/US:USA pronunciation: respellingUSA pronunciation: respelling(do̅o̅ tēr′ē əm, dyo̅o̅-)

deu•te•ri•um (do̅o̅ tēr′ē əm, dyo̅o̅-),USA pronunciation n. [Chem.]

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

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

'deuterium' also found in these entries (note: many are not synonyms or translations):

D - deuteride - deuterium oxide - deutero- - deuteron - heavy hydrogen - heavy water - hydrogen - Urey - D, d - deuterate - fusion - H, h - ICF

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deuterium