nitrite

The univalent anionic group NO₂, derived from nitrous acid, or a compound containing this group.

A salt of nitrous acid. Azotite is a synonym.

A salt or ester of nitrous acid; a compound bearing the -NO2 radical.

a yellow oily volatile liquid, used in medicine as a depressant and a vaso-dilator. Its inhalation produces an instantaneous flushing of the face.

any salt or ester of nitrous acid

the univalent radical -NO2, and the anion NO2-

the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)