Source : Webster's Revised Unabridged Dictionary (1913)

Tetrazone \Tet"ra*zone\, n. (Chem.)
   Any one of a certain series of basic compounds containing a
   chain of four nitrogen atoms; for example, ethyl tetrazone,
   {(C2H5)2N.N2.N(C2H5)2}, a colorless liquid having an odor of
   leeks.