Diazo-

Di·az·o-

Diazo-
  1. 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. (Chem.)

Phrases & Compounds
Diazo reactions
a series of reactions whereby diazo compounds are employed in substitution. These reactions are of great importance in organic chemistry.