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disinfectant A chemical substance that kills or neutralizes harmful bacteria, viruses, and other microorganisms. Also known as an antiseptic or germicide. ■ I accidentally spilled coffee on my shirt and had to use a disinfectant to kill the stains.
peroxide A chemical compound with the formula H2O2, used in hair bleaching and as a disinfectant. ■ When she accidentally spilled peroxide on her shirt, she looked like she had a chemical accident on her chest.
formaldehyde A chemical compound with the formula HCHO. It is a gas at room temperature and is used as a preservative, disinfectant, and fumigant in various industries. ■ "I accidentally spilled some formaldehyde on my shirt while making my mom's favorite recipe. Now I smell like a chemical lab!"