Meanings
nounmetallic hydrogen (uncountable)
- uncountablea degenerate matter phase of hydrogen that is electrically conductive; formed under extreme pressure
Origin
From metallic + hydrogen. From hydrogen being like a metal, having free-roaming electrons that support electrical conductivity.
Full word history & related roots →Cite this entry
APA
metallic hydrogen. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/metallic%20hydrogen
MLA
“metallic hydrogen.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/metallic%20hydrogen. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “metallic hydrogen,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/metallic%20hydrogen.
Source: metallic hydrogen on Wiktionary, CC BY-SA 4.0.