
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-clas...
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http://en.wikipedia.org/wiki/Coronium
[gastropod] Coronium is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails. == Species == Species within the genus Coronium include: ...
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http://en.wikipedia.org/wiki/Coronium_(gastropod)

• (n.) The principal gaseous substance forming the solar corona, characterized by a green line in the coronal spectrum.
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http://thinkexist.com/dictionary/meaning/coronium/

(from the article `Sun`)
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http://www.britannica.com/eb/a-z/c/144
Co·ro'ni·um noun [ New Latin See
Corona .]
(Chem. & Astron.) The principal gaseous substance forming the solar corona, characterized by a green line in the coronal spectrum.
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http://www.encyclo.co.uk/webster/C/162

a hypothetical element once thought to exist because certain spectral lines in the emission spectrum of the solar corona could not be identified by known elements. These lines were subsequently found to be emitted by certain highly ionized metals.
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https://www.infoplease.com/dictionary/coronium
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