| 单词 | ium | 
| 释义 | -ium in British English or sometimes -um suffix forming nouns 1.  indicating a metallic element  platinum  barium 2.  (in chemistry) indicating groups forming positive ions  ammonium chloride  hydroxonium ion 3.  indicating a biological structure  syncytium Word originNew Latin, from Latin, from Greek -ion, diminutive suffix -ium in American English (iəm; jəm) 1.  a.    forming Modern Latin names for chemical elements   sodium b.    forming the names of certain positive ions   ammonium, carbonium 2.    forming the names of certain biological structures   conidium, syncytium Word originModL < L, ending of certain neuter nouns Definition of '-ium' | 
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