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A stable isotope of hydrogen with a mass approximately twice that of the usual isotope.
- ‘Although many nuclei can be fused, this subject normally refers to fusion of hydrogen isotopes deuterium or tritium to form helium.’
- ‘If necessary, stocks of deuterium, tritium, hydrogen, and helium were supplied from on-board stores.’
- ‘The most easily attained fusion reaction involves fusing nuclei of the two isotopes of hydrogen, deuterium and tritium, to make nuclei of helium.’
- ‘The basic principles are relatively simple to lay out: a high energy laser is used to heat and compress a small amount of deuterium, a stable isotope of hydrogen.’
- ‘We know that for a fact because we've measured the isotope ratio of deuterium and hydrogen.’
1930s: modern Latin, from Greek deuteros second.
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