nitronium
/nʌɪˈtrəʊnɪəm/Chemistry
noun
The cation NO2 +, which is the nitrating agent present in mixtures of concentrated nitric acid with another strong acid, and is formed by dissociation of nitric acid itself. Usually attributive.
Origin
1920s (in an earlier sense). From German Nitronium from nitro- + -onium.
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