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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
ammonium
1.
ammonium
(substance)
the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
Synonyms
ammonium ion
Broader (hypernym)
ammonia
Based on WordNet 3.0 copyright © Princeton University.
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. English edition:
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