The Collaborative International Dictionary of English v.0.48:

Eu \Eu\ n. (Chem.)
   the chemical symbol for Europium, an element with atomic
   number 63 and atomic weight 151.96.

   Syn: Europium.
        [PJC]

The Collaborative International Dictionary of English v.0.48:

Eu \Eu\ [Gr. e'y^ well, orig. neut. of e'y`s 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-.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

EU
       Execution Unit (CPU)