ethylene glycoln. A colorless sweet-tasting viscous diol, C2H6O2, used as an antifreeze in cooling and heating systems.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.ethylene glycol n (Elements & Compounds) another name for ethanediol Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014gly?col (?gla? k?l, -k?l) n. 1. a colorless, sweet liquid, C2H6O2, used chiefly as an automobile antifreeze and as a solvent. 2. any of a group of alcohols containing two hydroxyl groups. [1855?60; glyc (erin) + (alcoh) ol] gly?col?ic (-?k?l ?k) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.ethylene gly·col (gl??kôl?) A poisonous, syrupy, colorless alcohol, C2H6O2. It is used as an antifreeze in heating and cooling systems that use water.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.