Relating to a substance or treatment that supposedly prevents disease or strengthens resistance to illness, according to ancient medical theory.
From apo- (away) and phylactic (relating to guarding or protecting), with roots in Greek prophylaxis concepts, describing preventative medicine approaches.
Before modern vaccines and medicine, 'apophylactic' treatments included everything from wearing certain gems to specific diets—people were trying to prevent disease with whatever tools they had, which makes sense even if the science was wrong.
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