from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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).
from the GNU version of the Collaborative International Dictionary of English
- n. The principal gaseous substance forming the solar corona, characterized by a green line in the coronal spectrum.
from The Century Dictionary and Cyclopedia
- n. A gaseous element, unidentified as yet and thus far detected only in the solar corona.
What of that element unknown to us as part of earth which is seen only in the corona of the sun at eclipse that we call coronium?
It consists of various elements which exist in a condition of extreme tenuity; hydrogen, helium, and a substance called coronium appear to predominate, whilst finely divided shining particles of matter and electrical discharges resembling those of an aurora assist in its illumination.
Several skilled observers failed to see it at all; but Young and Eastman succeeded in tracing the green "coronium" ray all round the sun, to a height estimated at 340,000 miles.
The originating substance, designated "coronium," of which nothing is known to terrestrial chemistry, continues luminous  at least 300,000 miles above the sun's surface, and is hence presumably much lighter even than hydrogen.
( "coronium"), and also a faint continuous spectrum, in which even a few of the more prominent dark lines of the solar spectrum have been sometimes detected.
"coronium" has been given to the substance causing it.
I myself believe that they were probably solid — in a way of speaking — coronium.
And what miracles are there in coronium and nebulium which, as the child of nebula and sun, we inherit?
Since the ship was made of the Venerian metal, coronium, which was only slightly magnetic, the plate was obviously the magnet's only load.
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.
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