deuteron
noun
- atomic nucleus; having the symbol ²H⁺ or D⁺, is the +1 ion of deuterium, ²H or D
Wiktionary
noun
Etymology: From deutero- + -on. From deuterium, from Ancient Greek δεύτερος (deúteros, “second”).
- the nucleus of deuterium, consisting of a proton and a neutron