disinfectant

American  

[dis-in-fek-tuhnt] / ˌdɪs ɪnˈfɛk tənt /

noun

1. any chemical agent used chiefly on inanimate objects to destroy or inhibit the growth of harmful organisms.

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adjective

1. serving as a disinfectant.

disinfectant British  

/ ˌdɪsɪnˈfɛktənt /

noun

1. an agent that destroys or inhibits the activity of microorganisms that cause disease

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Etymology

Origin of disinfectant

1830–40; < French désinfectant, noun use of present participle of désinfecter, Middle French. See disinfect, -ant

Explanation

If you need to clean a nasty mess, grab some disinfectant. It's a powerful cleanser that kills bacteria. Disinfectant is a chemical that can destroy dangerous microorganisms — using it is the next best thing to sterilization. If someone in your family has had the flu, it makes sense to use a disinfectant when you clean the bathroom, just in case there are lingering germs on the doorknobs and faucets. Disinfectants are similar to antibiotics and antiseptics, except they're used on objects and surfaces rather than on (or in) our bodies.

Example Sentences

At 7:00 am, relatives brought packages: deodorant, toothpaste, soap and shampoo in labeled plastic bags, plus disinfectant and bleach -- provisions essential for maintaining hygiene in the latrines of tiny cells.

From Barron's • Jan. 10, 2026

"We've got biosecurity mats down with disinfectant all over them and are limiting who can go in the shed - usually it's just me," Ms Kennedy said.

From BBC • Nov. 23, 2025

The room was chilly because of the conservation regime and smelled of disinfectant.

From The Wall Street Journal • Nov. 11, 2025

Sunlight, too, is a great and timeless disinfectant: airy, open spaces don’t just allow air movement that reduces transmission risk — they actually let sunlight in where it can kill bacteria in the air.

From Salon • Feb. 21, 2025

We couldn’t use the phone at Lorraine’s anyway because her mother doesn’t have unlimited service, and at my house my mother is a disinfectant fanatic.

From "The Pigman" by Paul Zindel

Related Words

• hygienic
• sterile