disinfectant

noun

dis·​in·​fec·​tant ˌdis-in-ˈfek-tənt How to pronounce disinfectant (audio)
plural disinfectants
: 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)

Note: Common chemical disinfectants include chlorine, calcium and sodium hypochlorite, iodophor, phenol, ethanol, and quaternary ammonium compounds. Disinfectants are often distinguished from sterilants by having reduced effectiveness against dormant bacterial endospores.

Examples of disinfectant in a Sentence

They use a strong disinfectant on the medical equipment. Clean the area with disinfectant.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Most fitness centers have disinfectant wipes or sprays available for this purpose. Melanie Radzicki McManus, CNN, 25 Jan. 2025 Make sure to follow the manufacturer's instructions for the disinfectant product, including contact time (the time the surface needs to remain wet with the disinfectant to be effective). Daley Quinn, Southern Living, 13 Jan. 2025 Boiling, freezing, filtering, adding chlorine or other disinfectants, or letting water stand will not make the water safe to drink. Shyla Watson, People.com, 10 Jan. 2025 Krupin spent about $1,000 on initial supplies — a children’s gardening rake, trash bags, gloves, a dust pan and disinfectant — as well as an LLC, business insurance, a website domain, a cargo trailer and hitch for her car. Morgan Smith, CNBC, 12 Dec. 2024 See all Example Sentences for disinfectant 

Word History

First Known Use

1837, in the meaning defined above

Time Traveler
The first known use of disinfectant was in 1837

Dictionary Entries Near disinfectant

Cite this Entry

“Disinfectant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/disinfectant. Accessed 2 Feb. 2025.

Kids Definition

disinfectant

noun
dis·​in·​fect·​ant
dis-ᵊn-ˈfek-tənt
: something (as a chemical) that is able to destroy harmful germs (as bacteria and fungi)
disinfectant adjective

Medical Definition

disinfectant

1 of 2 noun
dis·​in·​fec·​tant -ˈfek-tənt How to pronounce disinfectant (audio)
: an agent (as a chemical or ultraviolet light) that destroys, inactivates, or significantly reduces the concentration of pathogens (as bacteria, viruses, and fungi) especially on hard surfaces and in water (as drinking water or wastewater)
also : a preparation or formulation containing one or more disinfectants along with additional additives (as water and fragrance)

Note: Common chemical disinfectants include chlorine, calcium and sodium hypochlorite, iodophor, phenol, ethanol, and quaternary ammonium compounds. Disinfectants are often distinguished from sterilants by having reduced effectiveness against dormant bacterial endospores.

disinfectant

2 of 2 adjective
: serving or tending to disinfect : suitable for use in disinfecting
Last Updated: - Updated example sentences
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