'disinfectant' originates from the Latin word 'disinfectare,' where 'dis-' meant 'apart' and 'infectare' meant 'to taint or infect.'

'disinfectare' transformed into the French word 'désinfecter,' and eventually became the modern English word 'disinfectant' through Middle English.

Initially, it meant 'to remove infection,' and this meaning has largely remained the same in modern usage.