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coronium

[kuh-roh-nee-uh m] /kəˈroʊ ni əm/
noun, Astronomy
1.
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 of coronium
1885-1890
1885-90; coron(a) + -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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