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)

Nearby words

  1. etymologize,
  2. etymology,
  3. etymon,
  4. etzel,
  5. eu,
  6. eubacteria,
  7. eubacterium,
  8. euboea,
  9. euboean,
  10. eucaine

Origin of eu-

< Greek, combining form of eús good (adj.) or eú, eû (neuter, used as adv.) well Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for eu-


combining form

well, pleasant, or goodeupeptic; euphony

Word Origin for eu-

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

Word Origin and History for eu-


word-forming element in modern use meaning "good, well," from comb. form of Greek eus "good," eu "well" (adv.), also "luckily, happily," from PIE *(e)su- "good" (cf. Sanskrit su- "good," Avestan hu- "good").

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for eu-



Good; well; true:eupepsia.
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.