combining form
Etymology: Middle English, from Latin, from Greek, from ey, eu, from neuter of eys good; akin to Hittite asus good and perhaps to Sanskrit asti he is — more at is
1.
a. : well : easily
eu plastic
— opposed to dys-
b. : good
eu daemon
— opposed to dys-
2.
a. : most typical : true
Eu ascomycetes
eu chromosome
b. : truly
eu coelomate
c. : having a complete life cycle
eu -form
3. : improved derivative of a (specified) substance
eu codeine