| NOUN | substance | ammonium ion, ammonium | the ion NH4 derived from ammonia |
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| Meaning | The ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion. | |
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| Synonym | ammonium | |
| Broader | ammonia | A pungent gas compounded of nitrogen and hydrogen (NH3) |
| Spanish | amonio | |
| Catalan | amoni | |
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