Meaning of arsonium in English:

arsonium

Pronunciation /ɑːˈsəʊnɪəm/

noun

Chemistry
  • An ion containing an arsenic atom bonded to four hydrogen atoms, AsH₄ +, analogous to ammonium and phosphonium; a substituted form of this. Chiefly attributive or as a formative element in chemical names.

Origin

Mid 19th century. From ars- + -onium.