eu

• POS: Noun

CIDE DICTIONARY

eu, n. 

 the chemical symbol for Europium, an element with atomic number 63 and atomic weight 151.96.  [PJC]

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]

OXFORD DICTIONARY

eu, symb. Chem. the element europium.