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
British Dictionary definitions for eu-

eu-

combining form
1.
well, pleasant, or good: eupeptic, euphony
Word Origin
via Latin from Greek, from eus good
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").

eu- in Medicine

eu- pref.

  1. Good; well; true: eupepsia.

  2. A derivative of a specified substance: euglobulin.