ionium

noun
io·​ni·​um | \ ī-ˈō-nē-əm How to pronounce ionium (audio) \

Definition of ionium

: a natural radioactive isotope of thorium having a mass number of 230

Examples of ionium in a Sentence

Recent Examples on the Web Rona set to work isolating a potential new element called ionium. New York Times, "Overlooked No More: Elizabeth Rona, Pioneering Scientist Amid Dangers of War," 28 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ionium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of ionium

1907, in the meaning defined above

History and Etymology for ionium

ion + -ium; so called from its ionizing action

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Time Traveler for ionium

Time Traveler

The first known use of ionium was in 1907

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Cite this Entry

“Ionium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ionium?pronunciation&lang=en_us&dir=i&file=ionium01. Accessed 25 Feb. 2020.

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More Definitions for ionium

ionium

noun
io·​ni·​um | \ ī-ˈō-nē-əm How to pronounce ionium (audio) \

Medical Definition of ionium

: a natural radioactive isotope of thorium having a mass number of 230

More from Merriam-Webster on ionium

Britannica.com: Encyclopedia article about ionium

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