arsonium
noun
ar·so·ni·um
är-ˈsō-nē-əm 
: a monovalent arsenic-containing radical AsH4 analogous to the ammonium radical NH4
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“Arsonium.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/arsonium. Accessed 30 Dec. 2024.
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