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methylene

American  
[meth-uh-leen] / ˈmɛθ əˌlin /

adjective

Chemistry.
  1. containing the methylene group.


methylene British  
/ ˈmɛθɪˌliːn /

noun

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

    a methylene group or radical

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

methylene Scientific  
/ mĕthə-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.


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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

During the steaming and roasting process, the beans get hot enough that residual methylene chloride evaporates.

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

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

“Exposure to methylene chloride has devastated families across this country for too long, including some who saw loved ones go to work and never come home,” EPA Administrator Michael Regan said in a statement.

From Seattle Times Apr. 30, 2024

It consists in fixing the dry preparation for 20 minutes in osmic acid vapour, and staining in a concentrated watery solution of methylene blue.

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

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