methylene

American  

[meth-uh-leen] / ˈmɛθ əˌlin /

adjective

Chemistry.

1. containing the methylene group.

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methylene British  

/ ˈmɛθɪˌliːn /

noun

1. (modifier) of, consisting of, or containing the divalent group of atoms =CH 2

   a methylene group or radical

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methylene Scientific  

/ mĕth′ə-lēn′ /

1. A bivalent hydrocarbon radical, CH ₂. Because it has two unshared electrons, it is extremely reactive and occurs only as an intermediate byproduct in chemical reactions. Methylene is a component of unsaturated hydrocarbons.

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Etymology

Origin of methylene

< French méthylène (coined in 1834), equivalent to Greek méth ( y ) wine ( see mead ¹) + hýl ( ē ) wood + French -ène -ene, taken to mean “wood-spirits” ( vin ou liqueur spiritueuse du bois ), though elements of the compound are in the wrong order to give this sense

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Example Sentences

See Examples For:

methylene

Increased supply of methylene diphenyl diisocyanate from new plants of other companies is also near-term concern.

From The Wall Street Journal ● Oct. 5, 2026

After producers decaffeinate coffee beans using methylene chloride, they steam the beans and dry them.

From Salon ● Jul. 23, 2024

The FDA and the Occupational Safety and Health Administration have deemed methylene chloride unsafe to consume at concentrations above 10 milligrams per kilogram of your body weight.

From Salon ● Jul. 23, 2024

The rule banning methylene chloride is the second risk management rule to be finalized by President Joe Biden’s administration under landmark 2016 amendments to the Toxic Substances Control Act.

From Seattle Times ● Apr. 30, 2024

If, on the other hand, a direct blue is topped with methylene blue, its brilliancy may be enhanced.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" by Various

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