Formaldehyde (noun)

1. A colorless, flammable gas with a strong, pungent odor, used in the manufacture of resins, plastics, and textiles, and as a disinfectant and preservative.
2. A solution of formaldehyde in water, used as a disinfectant and embalming fluid.

Origin:

Late 19th century: from formic acid + -aldehyde.

Examples:

1. Formaldehyde is used to preserve biological specimens in museums.
2. Formaldehyde is used as a disinfectant in hospitals and laboratories.
3. Formaldehyde is a component of many building materials, such as insulation and flooring.
4. Formaldehyde is a highly reactive molecule that can cause cancer.
5. Formaldehyde is a common air pollutant that can cause respiratory problems.