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eu-

1.
a combining form meaning “good,” “well,” occurring chiefly in words of Greek origin (eupepsia); in scientific coinages, especially taxonomic names, it often has the sense “true, genuine” (eukaryote)
Origin
< Greek, combining form of eús good (adj.) or eú, eû (neuter, used as adv.) well
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for eu-

eu-

combining form
1.
well, pleasant, or good eupeptic, euphony
Word Origin
via Latin from Greek, from eus good
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
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Word Origin and History for eu-
eu-
Gk. comb. form of eus "good," eu "well" (adv.).
Online Etymology Dictionary, © 2010 Douglas Harper
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eu- in Medicine

eu- pref.

  1. Good; well; true: eupepsia.

  2. A derivative of a specified substance: euglobulin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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