[proh-puh-leen] Chemistry.
containing the propylene group.
Also, propene. a colorless, flammable gas, C 3 H 6 , of the olefin series: used chiefly in organic synthesis.

1840–50; propyl + -ene Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
propylene (ˈprəʊpɪˌliːn)
another name for propene
[C19: from propyl + -ene]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

propylene pro·pyl·ene (prō'pə-lēn')
A flammable gas derived from processing petroleum hydrocarbon and used in organic synthesis. Also called propene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
propylene   (prō'pə-lēn')  Pronunciation Key 
A flammable gas produced by cracking (breaking down) petroleum and used to make plastics and isopropyl alcohol. Propylene is the second member of the alkene series. Also called propene. Chemical formula: C3H6.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


a colourless, flammable, gaseous hydrocarbon, C3H6, obtained from petroleum; large quantities of propylene are used in the manufacture of resins, fibres, and elastomers (see polyolefin), and numerous other chemical products. See glycol; propyl alcohol.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Lignin is a complex highly crosslinked array of phenyl propylene units that has its biosynthetic origin in phenylalanine.
Propylene dichloride is used as a chemical intermediate in several industries.
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