From Glossary of Meteorology
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Isotope of hydrogen, having one proton and one neutron in the nucleus; heavy hydrogen.

Deuterium is a nonradioactive form of hydrogen, occurring naturally with an abundance of about 0.016%. Deuterium is widely used in spectroscopic and kinetic studies, since the large relative mass difference from hydrogen can lead to very different chemical and physical properties of the compounds in which it is contained.