Disinfectant | Definition of Disinfectant by Merriam-Webster
Disinfectant definition is - an agent used to disinfect something; especially : a chemical agent that is used especially on hard surfaces and in water (such as drinking water or wastewater) to destroy, inactivate, or significantly reduce the concentration of pathogens (such as bacteria, viruses, and fungi). How to use disinfectant in a sentence.