coronium

== English == === Etymology === From corona +‎ -ium, coined by a certain A. Gruenwald. === Noun === coronium (uncountable) (historical) A supposed chemical element, hypothesized in the 19th century in order to explain a green emission line seen during the total solar eclipse of 7 August 1869 (actually highly ionized iron). ==== Coordinate terms ==== geocoronium nebulium == Dutch == === Etymology === Borrowed from English coronium, coined by a certain A. Gruenwald. Equivalent corona +‎ -ium. === Pronunciation === IPA(key): /ˌkoːˈroː.ni.ʏm/ Hyphenation: co‧ro‧ni‧um Rhymes: -oːniʏm === Noun === coronium n (uncountable, no diminutive) (historical, astronomy, chemistry) coronium (obsolete chemical element, hypothesised to exist based on a green emission line) ==== Derived terms ==== geocoronium