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1590s, perhaps from French désinfecter (16c.), or formed in English from dis- + infect. Related: Disinfected; disinfecting.
disinfect dis·in·fect (dĭs'ĭn-fěkt')v. dis·in·fect·ed, dis·in·fect·ing, dis·in·fects To cleanse something so as to destroy or prevent the growth of disease-carrying microorganisms.