The process or act of preventing sepsis or infection; a less common variant of antisepsis.
From 'anti-' (against) plus 'seption' (a hypothetical back-formation from sepsis), though this term is rare and largely superseded by 'antisepsis'.
While 'antiseption' is archaic medical terminology, it shows how English speakers were actively trying to name and systematize our understanding of infection prevention—even when they ultimately chose different terms.
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