A chemical compound containing both nitrogen (azo) and phosphorus groups bonded together.
From French 'azo-' (nitrogen compound prefix from French 'azote') + 'phosphore' (phosphorus-bearing), combining two chemical element references from French scientific terminology of the 19th century.
This word represents the kind of ultra-specific chemical terminology that exploded during the 1800s industrial dye revolution, when chemists started systematically naming thousands of new synthetic compounds by describing their atomic components like a chemical recipe.
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