<chemistry> A combining form or prefix meaning relating to a series of compounds containing a radical of two nitrogen atoms, united usually to an aromatic radical; as, diazo-benzene, C6H5.N2.OH.

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.

<chemistry> Diazo reactions, a series of reactions whereby diazo compounds are employed in substitution. These reactions are of great importance in organic chemistry.

Origin: Pref. Di- + azo-.

(29 Oct 1998)