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

Clean fashion follows in the footsteps of clean beauty, which had a significant rise in the early 2010s when brands such as Beautycounter began formulating products free from chemicals like parabens and formaldehyde — widely linked to health issues spanning from hormone disruption to cancer. —Sophie Benson, Vogue, 30 Oct. 2025

It was formulated free of typical eye irritants, including parabens, formaldehydes, phthalates, mineral oil, and contained less than one percent synthetic fragrance. —Essence, 28 Oct. 2025

And in Tennessee’s South Memphis, the methane gas turbines that power an xAI data center give off air pollutants contributing to smog and formaldehyde. —Natalie Kainz, NBC news, 28 Oct. 2025

For example, some 50% of hair straighteners contain toxic chemicals such as formaldehyde, which is linked to cancer. —Sandee Lamotte, CNN Money, 21 Oct. 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