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

Plus, most people brew their coffee at between 190 F to 212 F, which is another opportunity for methylene chloride to evaporate.

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

The chemical industry has argued that the EPA is overstating the risks of methylene chloride and that adequate protections have mitigated health risks.

From Seattle Times • Apr. 30, 2024

In a 2-year animal inhalation study sponsored by the National Toxicology Program, methylene chloride produced a significant increase in benign and malignant tumors of the lung and liver of male and female mice.

From Salon • Mar. 16, 2024

There were some interesting sensory manifestations, pains in the arms and legs after the injection, but these were removed by santonin or methylene blue.

From Psychotherapy by Walsh, James J. (James Joseph)