Meanings
noungeocoronium (uncountable)
- obsoleteuncountableclimatologyA hypothetical gaseous chemical element proposed to explain certain spectroscopic lines, and the green glow, found in the polar aurorae, that was later found to be explained by singly-ionized oxygen.
Origin
From geo- + corona + -ium, coined by Alfred Wegener in 1911.
Full word history & related roots →Cite this entry
APA
geocoronium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/geocoronium
MLA
“geocoronium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/geocoronium. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “geocoronium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/geocoronium.
Source: geocoronium on Wiktionary, CC BY-SA 4.0.