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deuterium

Syllabification: deu·te·ri·um
Pronunciation: /ˌdyo͞oˈtirēəm
 
/

Definition of deuterium in English:

noun

Chemistry
A stable isotope of hydrogen with a mass approximately twice that of the usual isotope. (Symbol: D)

Deuterium atoms have a neutron as well as a proton in the nucleus, and the isotope is present to about 1 part in 6,000 in naturally occurring hydrogen. It is used as a fuel in thermonuclear bombs, and heavy water (D2O) is used as a moderator in nuclear reactors

Example sentences
  • The most easily attained fusion reaction involves fusing nuclei of the two isotopes of hydrogen, deuterium and tritium, to make nuclei of helium.
  • Although many nuclei can be fused, this subject normally refers to fusion of hydrogen isotopes deuterium or tritium to form helium.
  • We know that for a fact because we've measured the isotope ratio of deuterium and hydrogen.

Origin

1930s: modern Latin, from Greek deuteros 'second'.

Definition of deuterium in:

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