One of the mysteries of the English language finally explained.
1Chemistry. A crystalline, tricyclic, heteroaromatic compound; 9,10-diazaphenanthrene, C₁₂H₈N₂. Now rare.
2Pharmacology. An analgesic and antipyretic drug, also called antipyrin.
Late 19th century; earliest use found in Journal of the Chemical Society. From pheno- + azo- + -one.
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