meth·​y·​lene ˈme-thə-ˌlēn How to pronounce methylene (audio)
: a divalent hydrocarbon group CH2 derived from methane

Examples of methylene in a Sentence

Recent Examples on the Web 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,, 17 Sep. 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'methylene.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


French méthylène, from Greek methy wine + hylē wood — more at mead

First Known Use

1835, in the meaning defined above

Time Traveler
The first known use of methylene was in 1835

Dictionary Entries Near methylene

Cite this Entry

“Methylene.” Dictionary, Merriam-Webster, Accessed 17 Jun. 2024.

Medical Definition


meth·​y·​lene ˈmeth-ə-ˌlēn How to pronounce methylene (audio) -lən How to pronounce methylene (audio)
: a bivalent hydrocarbon radical CH2 derived from methane by removal of two hydrogen atoms
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