First Known Use: 1907
Dictionary
ionium
noun io·ni·um \ī-ˈō-nē-əm\
Definition of IONIUM
: a natural radioactive isotope of thorium having a mass number of 230
ADVERTISEMENT
Origin of IONIUM
ion; from its ionizing action
Medical Dictionary
ionium
noun io·ni·um \ī-ˈō-nē-əm\
Medical Definition of IONIUM
: a natural radioactive isotope of thorium having a mass number of 230
Learn More About IONIUM
Browse
Next Word in the Dictionary: ionization chamberPrevious Word in the Dictionary: IonismAll Words Near: ionium
ADVERTISEMENT
Seen & Heard
What made you want to look up ionium? Please tell us where you read or heard it (including the quote, if possible).