geocoronium
English edit
Etymology edit
geo- + corona + -ium, coined by Alfred Wegener in 1911.
Noun edit
geocoronium (uncountable)
- (geophysics, meteorology, obsolete) A 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.