How Do You Spell ONIUM?
Correct spelling for the English word "onium" is [ˈə͡ʊni͡əm], [ˈəʊniəm], [ˈəʊ_n_iə_m] (IPA phonetic alphabet).
Correct spelling for the English word "onium" is [ˈə͡ʊni͡əm], [ˈəʊniəm], [ˈəʊ_n_iə_m] (IPA phonetic alphabet).