D defs.my
Entry 1 sense Webster, 1913

Diazo-

· Di·az·o- · IPA
01 A combining form (also used adjectively), meaning pertaining to, or derived from, a series of compounds containing a radical of two nitrog…
  1. 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.