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Definitions

formaldehyde

[fawr-mal-duh-hahyd, fer-] / fɔrˈmæl dəˌhaɪd, fər- /
NOUN
preservative
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That discovery immediately caught their attention because formaldehyde is produced when methane breaks down in the atmosphere.

From Science Daily • May 10, 2026

The suit claims xAI’s 27 turbines emit nitrogen oxides and formaldehyde, linked to asthma, heart problems, and cancers.

From Barron's • Apr. 14, 2026

Composite wood products can be bound with formaldehyde.

From BBC • Mar. 16, 2026

But a recent FAA-funded study found two chemicals that can: formaldehyde, a known carcinogen and neurotoxin, and tridecane, which can cause headaches and stupor.

From The Wall Street Journal • Sep. 14, 2025

“They’re, like, coiled up in bottles and nobody loves them. God, wouldn’t it be depressing if after you died your relatives, like, preserved you in formaldehyde and kept you in a giant jar?”

From "Genuine Fraud" by E. Lockhart




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