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nounSynonym of quadrium (“isotope of hydrogen”).
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Origin
So named because it is the isotope of hydrogen that has four nucleons (a proton and three neutrons).
Full word history & related roots →Cite this entry
APA
hydrogen-4. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/hydrogen-4
MLA
“hydrogen-4.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hydrogen-4. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “hydrogen-4,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/hydrogen-4.
Source: hydrogen-4 on Wiktionary, CC BY-SA 4.0.