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coronium

[kuh-roh-nee-uhm]

co·ro·ni·um

[kuh-roh-nee-uhm]
noun Astronomy.
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.

Origin:
1885–90; coron(a) + -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Coronium is always a great word to know.
So is system. Does it mean:
the time when the sun is farthest south from the celestial equator occurring around December 21st
a number of heavenly bodies associated and acting together according to certain natural laws
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