An archaic spelling of acetanilide, an organic compound that was historically used as a pain reliever but is now recognized as toxic.
From acetic acid + aniline + -id (older suffix form). This represents older chemical nomenclature that has been modernized to 'acetanilide'.
Acetanilid is a cautionary tale—it was used as a medicine before doctors realized it could damage your kidneys and blood cells, showing how chemistry and medicine had to learn together.
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