ionium

[ ahy-oh-nee-uhm ]

nounChemistry.
  1. a naturally occurring radioactive isotope of thorium. Symbol: Io; atomic number: 90; atomic weight: 230.

Origin of ionium

1
First recorded in 1905–10; ion + -ium

Words Nearby ionium

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use ionium in a sentence

  • ionium expels an alpha particle and becomes radium, which is a bivalent element resembling barium belonging to the second group.

    A Brief Account of Radio-activity | Francis Preston Venable

British Dictionary definitions for ionium

ionium

/ (aɪˈəʊnɪəm) /


noun
  1. obsolete a naturally occurring radioisotope of thorium with a mass number of 230: Symbol: Io

Origin of ionium

1
C20: from New Latin, from ion + -ium

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012