ionium

noun

io·​ni·​um ī-ˈō-nē-əm How to pronounce ionium (audio)
: a natural radioactive isotope of thorium having a mass number of 230

Examples of ionium in a Sentence

Recent Examples on the Web
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Rona set to work isolating a potential new element called ionium. New York Times, 28 Aug. 2019

Word History

Etymology

ion + -ium; so called from its ionizing action

First Known Use

1907, in the meaning defined above

Time Traveler
The first known use of ionium was in 1907

Dictionary Entries Near ionium

Cite this Entry

“Ionium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ionium. Accessed 26 Nov. 2024.

Medical Definition

ionium

noun
io·​ni·​um ī-ˈō-nē-əm How to pronounce ionium (audio)
: a natural radioactive isotope of thorium having a mass number of 230

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