noun
Chemistry term for the stable hydrogen isotope with one proton and one neutron. Often contrasted with 軽水素 (protium) and 三重水素 (tritium).
重水素は核融合反応の燃料として研究されている。
Deuterium is being studied as a fuel for nuclear fusion reactions.
重水素を含む水を重水という。
Water containing deuterium is called heavy water.