| n. | 1. | (Chem.) the chemical symbol for Europium, an element with atomic number 63 and atomic weight 151.96. |
| 1. | A prefix used frequently in composition, signifying well, good, advantageous; - the opposite of dys-. |
| Noun | 1. | Eu - a bivalent and trivalent metallic element of the rare earth group Synonyms: atomic number 63, europium |
| 2. | EU - an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members; "he took Britain into Europe" Synonyms: Common Market, EC, EEC, European Community, European Economic Community, European Union, Europe |