One of the mysteries of the English language finally explained.
A medicinal preparation containing or consisting of acetylphenylhydrazine, CH₃CO·NH·NHC₆H₅, formerly used as an antipyretic and in the treatment of polycythaemia.
Late 19th century. From ancient Greek πυρώδης like fire, fiery (from πῦρ fire + -ώδης) + -in.
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