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The Collaborative International Dictionary
Hyponitrite

Hyponitrite \Hy`po*ni"trite\, n. (Chem.) A salt of hyponitrous acid.

Wiktionary
hyponitrite

n. (context inorganic chemistry English) The oxyanion of nitrogen NO- derived from hyponitrous acid; any salt containing this anion

Wikipedia
Hyponitrite

A hyponitrite refers to ionic compounds that contain the hyponitrite ion, , ([ON=NO]) or to organic hyponitrites (RON=NOR), for example di-tert butyl hyponitrite.