formaldehyde

noun

form·​al·​de·​hyde fȯr-ˈmal-də-ˌhīd 

fər-

: a colorless pungent irritating gas CH₂O used chiefly in aqueous solution as a disinfectant and preservative and in chemical synthesis

Examples of formaldehyde in a Sentence

Recent Examples on the Web

Opponents say the supercomputing center is stressing the power grid, and that the turbines emit smog and carbon dioxide, pollutants that cause lung irritation such as nitrogen oxides, and the carcinogen formaldehyde, experts say. —Adrian Sainz, Los Angeles Times, 17 June 2025

Treatments like Brazilian blowouts can contain formaldehyde, which Nathan says can cause inflammation or an allergic reaction. —Kiana Murden, Vogue, 25 Mar. 2025

According to experts, consumers worried about formaldehyde should: Review ingredient lists. —Kaitlin Sullivan, Health, 17 May 2025

Formaldehyde-releasing products need not be listed as formaldehyde on ingredient labels. —Ronnie Cohen, NPR, 8 May 2025

Word History

Etymology

International Scientific Vocabulary form- + aldehyde

First Known Use

1872, in the meaning defined above

Phrases Containing formaldehyde

• urea-formaldehyde

Rhymes for formaldehyde

• acetamide
• acetonide
• acidified
• antimonide
• beatified
• benzaldehyde
• borohydride
• chalcogenide
• commodified
• decalcified
• declassified
• disaccharide

Kids Definition

formaldehyde

noun

form·​al·​de·​hyde fȯr-ˈmal-də-ˌhīd 

fər-

: a colorless gas that consists of carbon, hydrogen, and oxygen, has a sharp irritating odor, and when dissolved in water is used to disinfect or to prevent decay

Medical Definition

formaldehyde

noun

form·​al·​de·​hyde fȯr-ˈmal-də-ˌhīd, fər- 

: a colorless pungent irritating gas CH₂O used chiefly as a disinfectant and preservative and in chemical synthesis