EUROPIUM

europium, Eu, atomic number

(noun) a bivalent and trivalent metallic element of the rare earth group

Source: WordNet® 3.1

Etymology

Noun

europium (uncountable)

A metallic chemical element (symbol Eu) with an atomic number of 63.

Source: Wiktionary

Eu*ro"pi*um, n. [NL.; Europe + -ium, as in aluminium.] (Chem.)

Definition: A metallic element of the rare-earth group, discovered spectroscopically by Demarcay in 1896. Symbol, Eu; at. wt., 152.0.

Source: Webster’s Unabridged Dictionary 1913 Edition