Meanings
Synonyms & antonyms
nounSynonym of deuterium.
Similar
Also see
Origin
So named because it is the isotope of hydrogen that has two nucleons (a proton and a neutron).
Full word history & related roots →Cite this entry
APA
hydrogen-2. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/hydrogen-2
MLA
“hydrogen-2.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hydrogen-2. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “hydrogen-2,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/hydrogen-2.
Source: hydrogen-2 on Wiktionary, CC BY-SA 4.0.