A chemical substance used to destroy harmful bacteria, viruses, and other microorganisms on surfaces or objects.
This word emerged in the 1890s from the Latin prefix 'dis-' (apart, away) and 'infectant' from 'inficere' (to stain, dye, corrupt). Surprisingly, the root word originally meant 'to dye' or 'stain' rather than anything medical! The Romans used 'inficere' for dying cloth, but the meaning shifted to 'corrupt' or 'taint' by the Middle Ages, then evolved into our modern sense of bacterial contamination only after germ theory was established.
The word 'disinfectant' literally means 'un-stainer' — which makes perfect sense when you realize that before we understood germs, people thought disease came from bad smells and stains. Medieval physicians believed that foul odors and discolored surfaces carried illness, so 'cleaning the stain' was their primitive form of what we now call disinfection.
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