zygo-(word root)1. doubleExamples: zygodactyl2. yoke, yoke-shapedExamples: zygomorphicAbused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embreezygo- or zyg-pref.1. Yoke; pair: zygodactyl.2. Union: zygospore.[New Latin, from Greek zugo-, from zugon, yoke; see yeug- in Indo-European roots.]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.zygo- or before a vowel zyg-combining formindicating a pair or a union: zygodactyl; zygospore. [from Greek zugon yoke]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014zygo- a combining form meaning ?yoke,? ?zygote?: zygomorphism. Also, esp. before a vowel,zyg-. [comb. form of Greek zygón yoke] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.