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 (rē′tēn′, rĕt′ēn′)
A crystalline phenanthrene derivative, C18H18, derived from pine tar, fossil resins, and tar oils.

[From Greek rhētīnē, resin.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈriːtiːn; ˈrɛt-)
(Elements & Compounds) a yellow crystalline hydrocarbon found in tar oils from pine wood and in certain fossil resins. Formula: C18H18
[C19: from Greek rhētinē resin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈri tin, ˈrɛt in)

a crystalline hydrocarbon, C18H18, derived from pine tar and other resins, and used in organic synthesis.
[1865–70; < Greek rhēt(inē) resin + -ene]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The molecular weight of the compounds investigated ranged from 234 kDa for retene (1-methyl-7-isopropyl-phenanthrene) to 300 kDa for coronene.
Facebook groups such as Retenes California, for instance, routinely post information on ICE, Border Patrol and checkpoints around the state.