Di·az·o-  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.

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 diazo
      adj : relating to or containing diazonium
      [also: diazoes (pl)]