arsonium

arsonium
\\ärˈsōnēəm\ noun (-s)
Etymology: ars- + ammonium
: a univalent radical AsH4 containing arsenic analogous to ammonium and known in the form of organic derivatives (as tetramethyl-arsonium iodide As(CH3)4I) — compare quaternary ammonium compound

* * *

arsonium Chem.
(ɑːˈsəʊnɪəm)
[f. ars-enic + termination of ammonium.]
A name applied (chiefly in combination) to a univalent organic arsenic radical, analogous in composition to ammonium and phosphonium, as tetramethyl-arsonium As(CH3)4. Hence arsonic (ɑːˈsɒnɪk), a., pertaining to arsonium; applied to a group of acids, analogous to the phosphonic acids (Fownes).

Useful english dictionary. 2012.

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