To clean something with a chemical agent in order to destroy bacteria and other harmful microorganisms.
From French 'désinfecter' (1740s), combining Latin 'dis-' (apart, away) and 'inficere' (to taint, corrupt). The concept emerged as germ theory developed, transforming from general 'purification' to specific antimicrobial action in the 19th century.
Before germ theory, disinfection was often about bad smells and 'miasmas' rather than invisible microbes. The word evolved alongside our understanding of disease, transforming from removing 'corruption' to targeting specific pathogens we couldn't even see until microscopy advanced.
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