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Used allusively to denote the source of poetic inspiration, or a person's poetic power, voice, or method.
Late 16th century; earliest use found in Philip Sidney (1554–1586), author and courtier. From Aganippe (classical Latin Aganippē, Hellenistic Greek Ἀγανίππη), the name of a fountain on Mount Helicon sacred to the Muses.