The Collaborative International Dictionary
Coronium \Co*ro"ni*um\, n. [NL. See Corona.] (Chem. & Astron.) The principal gaseous substance forming the solar corona, characterized by a green line in the coronal spectrum.
Wiktionary
n. (cx chemical element obsolete English) A supposed chemical element, hypothesized in the 19th century in order to explain a green emission line seen during a solar eclipse (actually highly ionized iron).
Wikipedia
Coronium, also called newtonium, was the name of a suggested chemical element, hypothesised in the 19th century. It was named after the solar corona. This new atomic thin green line in the solar corona was then considered to be provenient from a new element unlike anything else seen under laboratory conditions. Because of this it was also mis-classified as Iron Line Number 1474.
Coronium is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails.
Usage examples of "coronium".
We have located in the sun the spectrum of an element we have named coronium—and I think you have a specimen of coronium in your hand there!
Arcot said, "as chef, suppose you see what you can concoct while Wade and I start on this piece of coronium and see what there is to learn.
He sat at the very bow, protected behind eight-inch coronium plates in which were set masses of fused quartz that were nearly as strong as the metal itself.
Since the ship was made of the Venerian metal, coronium, which was only slightly magnetic, the plate was obviously the magnet's only load.
I took a coronium hack saw that will eat through niolyodenum steel like so much cheese, and it just wore its teeth off.
These were elements not found in nature: scarlet coronium, purple imperex, noble copper, starsilver, among metals.
A community that, perhaps, had left trees still growing in coronium rich soil Descending, Wenty turned his steps east.