1. Also propene. a colorless, flammable gas, C3H6, of the olefin series: used chiefly in organic synthesis.

Origin of propylene

First recorded in 1840–50; propyl + -ene Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for propylene


  1. another name for propene

Word Origin for propylene

C19: from propyl + -ene
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

propylene in Medicine


  1. A flammable gas derived from processing petroleum hydrocarbon and used in organic synthesis.propene
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

propylene in Science


  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.