the bivalent group −N=N− united to two aromatic groups, as in azobenzene.
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Origin of azo group
First recorded in 1890–95
Also called azo radical.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for azo group
The azo-group is particularly active, both the aliphatic and aromatic compounds being coloured.