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

Example Sentences

Recent Examples on the Web 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 1 Apr. 2023.

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
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

What Did You Just Call Me?

  • brown chihuahua sitting on the floor with squinting eyes looking at the camera
  • Before we went to her house, Hannah told us her aunt was a flibbertigibbet.
True or False

Test your knowledge - and maybe learn something along the way.

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?