'amidoazo' originates from combining 'amido-' from 'amide' and 'azo-' from 'azote', where 'amide' refers to a compound containing a carbonyl group bonded to a nitrogen atom, and 'azote' is an old term for nitrogen.

'amidoazo' was formed by combining the chemical terms 'amido' and 'azo', reflecting its dual chemical nature.

Initially, it referred to compounds with both amido and azo groups, and this meaning has remained consistent.