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From The Collaborative International Dictionary of English v.0.48:
Nitrite \Ni"trite\, n. [Cf. F. nitrite. See Niter.] (Chem.) A salt or ester of nitrous acid; a compound bearing the -NO2 radical. [1913 Webster +PJC] Amyl nitrite, a yellow oily volatile liquid, used in medicine as a depressant and a vaso-dilator. Its inhalation produces an instantaneous flushing of the face. [1913 Webster]