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 ( 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

Example Sentences

Ethyl acetate and methylene chloride are two common solvents used to extract caffeine from green coffee beans.

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

While the EPA banned one consumer use of methylene chloride in 2019, use of the chemical has remained widespread and continues to pose significant and sometimes fatal danger to workers, the agency said.

From Seattle Times • Apr. 30, 2024

Wendy Hartley, whose son Kevin died from methylene chloride poisoning after refinishing a bathtub at work, called the new rule “a huge step that will protect vulnerable workers.”

From Seattle Times • Apr. 30, 2024

Ehrlich has used a double stain with neutral red and methylene blue.

From Histology of the Blood Normal and Pathological by Myers, W.