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ionium

[ahy-oh-nee-uh m] /aɪˈoʊ ni əm/
noun, Chemistry
1.
a naturally occurring radioactive isotope of thorium. Symbol: Io; atomic number: 90; atomic weight: 230.
Origin
1905-1910
1905-10; ion + -ium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ionium

ionium

/aɪˈəʊnɪəm/
noun
1.
(obsolete) a naturally occurring radioisotope of thorium with a mass number of 230 Io
Word Origin
C20: from New Latin, from ion + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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