| 单词 | onium | 
| 释义 | onium in British Englishnoun  onium compound -onium in American English (ˈoʊniəm)   Chemistry  1.    any of a group of compounds that are isologues of ammonium   sulfonium 2.    a cation   hydronium Word origin<  ammonium Examples of 'onium' in a sentence | 
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