Eu
.
[Gr.
εὖ
well, orig. neut. of
εὔσ
good; prob. connected with Skr.
su
, from the same root as E.
is
; or with Skr.
vasu
good, prob. fr. the same root as E.
was
.]
A prefix used frequently in composition, signifying well, good, advantageous; – the opposite of dys-.