\Di*az"o-\ [Pref. di- + azo-] (Chem.)
A combining form (also used adjectively), meaning pertaining
to, or derived from, a series of compounds containing a
radical of two nitrogen atoms, united usually to an aromatic
radical; as, diazo-benzene, {C6H5.N2.OH}.
Note: Diazo compounds are in general unstable, but are of
      great importance in recent organic chemistry. They are
      obtained by a partial reduction of the salts of certain
      amido compounds.
{Diazo reactions} (Chem.), a series of reactions whereby
   diazo compounds are employed in substitution. These
   reactions are of great importance in organic chemistry.