azo group

noun Chemistry.
the bivalent group −N=N− united to two aromatic groups, as in azobenzene.
Also called azo radical.

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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azo group

the bivalent group -N=N- united to two hydrocarbon groups 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Generation of the azo group, and thusly the dye, on cotton itself has been practiced nearly a hundred years.
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