1) Chemical group 2) Containing nitrogen 3) Containing the azo group 4) Double-bonded nitrogen group 5) Dye class 6) Dye family 7) Dye group 8) Dye type 9) Dyes containing nitrogen 10) Group 11) Group of dyes 12) Kind of compound in chemistry 13) Kind of dye 14) Kind of dye with vivid colors 15) Like some synthetic colorants 
azo compound; azo group; azo dye. The azo group has the general structure Ar-N=N-Ar', where Ar and Ar' indicate substituted aromatic rings. Compounds containing the azo compounds are often intensely colored and are economically important as dyes. Methyl orange is an example of an azo dye.
[Jurist] Chapter House stairs at Wells Cathedral - Picture by R Neil Marshman (c) 23 November 2006 - taken on Motorola Rzr phone. ...
[adj] - relating to or containing the azo radical
adjective relating to or containing the azo radical
containing the azo group.