diazonium

 
Pronunciation: /ˌdʌɪəˈzəʊnɪəm/

noun

[as modifier] Chemistry
  • an organic cation containing the group N2+ bonded to an organic group. Aromatic diazonium compounds are typically intensely coloured and include many synthetic dyes: a diazonium salt diazonium chloride

Origin:

late 19th century: coined in German from diazo- (indicating the presence of two nitrogen atoms) + the suffix -onium (from ammonium)