One of the mysteries of the English language finally explained.
Any of a class of synthetic red xanthene dyes employed chiefly as microscopic stains; (in later use) especially either of two such dyes (in full "pyronin Gor Y" and "pyronin B").
Late 19th century; earliest use found in Journal of the Chemical Society. From German Pyronin, originally a trademark, probably from pyro- + -in, with inserted -n-.
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