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"Ammonium" is a chemistry word for a particular kind of positively-charged particle (an ion) made from nitrogen and hydrogen, written as NH4+. You'll meet it mostly in chemistry class or on the ingredients list of things like and cleaning products - "ammonium nitrate" and "ammonium " are common examples. It's closely related to "ammonia," the strong-smelling gas, but they are not exactly the same thing.
銨（離子），常見於肥料、清潔劑成分
組成From "ammonia" (the strong-smelling gas, itself named after Ammon, an ancient Egyptian god, because salts linked to it were first collected near a temple of his) + "-ium" (a chemistry ending often used for elements and related substances).
同家族的字
- ammoniathe closely related gas that ammonium comes from
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
ammoniumnoun/əˈmoʊni.əm/
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chemistryinorganic-chemistrynatural-sciencesThe univalent NH₄⁺ cation, derived by the protonation of ammonia
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chemistrynatural-sciencesorganic-chemistryAny similar cation formed by replacing one or more hydrogen atoms with alkyl or aryl radicals
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。