Definition of peroxynitrate in US English:

peroxynitrate

noun

Chemistry
  • A nitrate containing a higher proportion of oxygen than the simple nitrate; specifically one containing the group —O—ONO₂.

Origin

Late 19th century; earliest use found in Journal of the Chemical Society. From peroxy- + nitrate, after French peroxy-azotate.

Pronunciation

peroxynitrate

/pəˌrɒksɪˈnʌɪtreɪt/