We found 3 dictionaries that define the word onium compounds:

General (2 matching dictionaries)

1. onium compounds: Collins English Dictionary
2. Onium compounds: Wikipedia, the Free Encyclopedia

Medicine (1 matching dictionary)

3. Medical Dictionary (No longer online)

▸ Words similar to onium compounds ▸ Usage examples for onium compounds ▸ Idioms related to onium compounds ▸ Wikipedia articles (New!) ▸ Words that often appear near onium compounds ▸ Rhymes of onium compounds ▸ Invented words related to onium compounds