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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.

Preserved in formaldehyde and paraffin wax, they come from patients treated at the UK's national bowel hospital, St Mark's, in northwest London.

From Barron's • Feb. 4, 2026

Niosh’s limits for formaldehyde and tributyl phosphate are for a period of up to 10 hours over a 40-hour work week.

From The Wall Street Journal • Sep. 14, 2025

In addition to smoke and soot, the space agency detected large plumes of harmful gases emanating from the wildfires, including lung-irritating nitrogen dioxide and cancer-causing formaldehyde.

From Los Angeles Times • Jan. 16, 2025

Some VOCs, such as dioxins, benzene, formaldehyde and PAHs, can be toxic to humans.

From Salon • Jan. 8, 2025

It was my favorite class because it was the only one held in a regular classroom—no jars of cow hearts, no smell of formaldehyde, no cages full of screaming monkeys.

From "The Secret History" by Donna Tartt