butylene

[byoot-l-een] Chemistry.
noun
1.
Also, butene. any of three isomeric, gaseous hydrocarbons having the formula C 4 H 8 , of the alkene series.
adjective
2.
containing the butylene group.

Origin:
1875–80; butyl + -ene

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Collins
World English Dictionary
butylene (ˈbjuːtɪˌliːn)
 
n
another name for butene

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
butylene   (byt'l-ēn')  Pronunciation Key 
Any of three gaseous hydrocarbons that consist of four carbon atoms in a chain with a double bond between two of the carbons. They are part of the alkene series. Butylenes are used to make synthetic rubber. Chemical formula: C4H8.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

butylene

any of four isomeric compounds belonging to the series of olefinic hydrocarbons. The chemical formula is C4H8. The isomeric forms are 1-butene, cis-2-butene, trans-2-butene, and isobutylene. All four butenes are gases at room temperature and pressure.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Investigation of selected potential environmental contaminants: ethylene glycol, propylene glycols and butylene glycols.
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