Medical term:

ionium


i·o·ni·um

(ī-ō'nē-ŭm),
Former term for thorium-230.
[G. iōn, going]
Farlex Partner Medical Dictionary © Farlex 2012

ionium

(ī-ō′nē-ŭm) [ ion + -ium] Io
A natural radioactive isotope of thorium. Ionium is of historical significance only. It was the name given to the element now called thorium (230) .
Medical Dictionary, © 2009 Farlex and Partners

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