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eu-(word root) happiness, well-being
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
1. Good; well; true: euplastic.
2. A derivative of a specified substance: eucaine.
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.
well, pleasant, or good: eupeptic; euphony.
[via Latin from Greek, from eus good]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a combining form meaning “good,” “well,” occurring orig. in loanwords from Greek (Eucharist; eudemon); in scientific coinages, esp. taxonomic names, it often has the sense “true, genuine” (eukaryote).
[< Greek, comb. form of eús good or eú, eû well]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.