coronium

Etymology
From, coined by a certain A. Gruenwald.

Noun

 * 1)  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).

Etymology
Borrowed from, coined by a certain A. Gruenwald. Equivalent.

Noun

 * 1)   obsolete chemical element, hypothesised to exist based on a green emission line