Substances or chemicals that kill harmful bacteria, viruses, and germs to make something clean and safe.
From dis- (remove) + infect (from Latin inficere, to spoil or corrupt) + -ant (agent noun suffix). The word emerged in the 19th century as scientific understanding of germs developed.
Before we had the word 'disinfectant,' people used alcohol, bleach, and other harsh chemicals without really understanding why they worked—germ theory changed everything!
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