See Also: -onium(medicine)
onium(dictionary)

onium (iou)



-onium suffix.
[Extracted from AMMONIUM.]
Chemistry. Forming names of complex cations of a more or less electronegative element, often bonded to protons, as carbonium, diazonium, etc.
Physics. Forming names of bound states of a particle and its antiparticle, as charmonium.