In chemistry, describing a compound containing two azo groups (N=N double bonds) in its molecular structure.
From dis- (prefix meaning 'two') + azo (from German Azofarbstoff, itself from French azote, meaning nitrogen). This technical term developed in organic chemistry during the 19th century.
Disazo dyes are what make many bright synthetic colors possible — the chemistry of naming reflects the chemistry itself, with 'dis-' literally meaning there are two of the reactive azo bonds.
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