methylene
noun
meth·y·lene
ˈme-thə-ˌlēn 
-lən
: a divalent hydrocarbon group CH2 derived from methane
Examples of methylene in a Sentence
Recent Examples on the Web
Some nail hardeners and polishes contain formaldehyde that may be listed on the product label as formalin or methylene glycol, according to the Food and Drug Administration.
—
Topher Sanders, ProPublica, 9 Dec. 2024
To avoid it, scan ingredient lists for toluene sulfonamide/formaldehyde resin, formalin, and methylene glycol – all ingredients that indicate formaldehyde is either in the formula or released by the formula.
—Marci Robin, Allure, 29 Jan. 2024
Brazilian blowout products are often marketed as formaldehyde-free, but Baum tested some of them in his lab and found that the methylene glycol emitted relatively high concentrations of formaldehyde.
—Syris Valentine, Scientific American, 14 Nov. 2023
An example includes methylene glycol, often part of the formula in these products.
—Elizabeth Ayoola, Essence, 20 Oct. 2023
There’s benzene, methylene, and aromatic hydrocarbons, carcinogenic.
—Lindsey Bartlett, Forbes, 28 Apr. 2021
Covestro also manufacturers the more technically-challenging methylene diphenyl diisocyanate, or MDI, used to make polyurethanes for insulation.
—Andrew Marc Noel, Bloomberg.com, 17 Sep. 2020
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Topher Sanders, ProPublica, 9 Dec. 2024
To avoid it, scan ingredient lists for toluene sulfonamide/formaldehyde resin, formalin, and methylene glycol – all ingredients that indicate formaldehyde is either in the formula or released by the formula.
—Marci Robin, Allure, 29 Jan. 2024
Brazilian blowout products are often marketed as formaldehyde-free, but Baum tested some of them in his lab and found that the methylene glycol emitted relatively high concentrations of formaldehyde.
—Syris Valentine, Scientific American, 14 Nov. 2023
An example includes methylene glycol, often part of the formula in these products.
—Elizabeth Ayoola, Essence, 20 Oct. 2023
There’s benzene, methylene, and aromatic hydrocarbons, carcinogenic.
—Lindsey Bartlett, Forbes, 28 Apr. 2021
Covestro also manufacturers the more technically-challenging methylene diphenyl diisocyanate, or MDI, used to make polyurethanes for insulation.
—Andrew Marc Noel, Bloomberg.com, 17 Sep. 2020
Cite this Entry
“Methylene.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/methylene. Accessed 28 May. 2025.
Copy CitationMedical Definition
methylene
noun
meth·y·lene
ˈmeth-ə-ˌlēn
-lən
-lən
: a bivalent hydrocarbon radical CH2 derived from methane by removal of two hydrogen atoms
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