Definition of formaldehyde in English:


Syllabification: form·al·de·hyde
Pronunciation: /fôrˈmaldəˌhīd, fər-


  • A colorless pungent gas in solution made by oxidizing methanol.
    • Alternative name: methanal; chemical formula: CH2O
    More example sentences
    • Set on fire, these items release formaldehyde, polyvinyl chloride, and dioxins.
    • They are produced by the polymerization reaction of phenol and formaldehyde.
    • Bleach, ethyl alcohol, and formaldehyde can kill the virus in the environment.


late 19th century: blend of formic acid and aldehyde.

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Pronunciation: kərf
a slit made by cutting with a saw