Relating to or containing azo compounds; specifically used in chemistry to describe substances with N=N double bonds.
From 'azo-' (nitrogen bonded to nitrogen) + '-ic' (relating to). A straightforward adjectival form from the azo chemistry terminology developed in the 19th century.
When chemists call something 'azonic,' they're pointing to that crucial N=N double bond—this seemingly small feature is what makes the whole molecule behave differently and creates colors and reactivity that wouldn't exist otherwise.
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