Definition of nitrosonium in English:

nitrosonium

noun

Chemistry
  • The nitrosyl cation NO+, formed when nitrogen oxides dissolve in very strong acids. Usually attributive.

Origin

1930s; earliest use found in Chemical Abstracts. From nitroso- + -onium.

Pronunciation

nitrosonium

/ˌnʌɪtrəʊˈsəʊnɪəm/