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• Eu
  Eu

  europium.
• EU
  EU

  abbreviation

  European Union.
• eu-
  eu-

  a combining form meaning “good,” “well,” occurring chiefly in words of Greek origin (eupepsia ); in scientific coinages, especially taxonomic names, it often has the sense “true, genuine” (eukaryote )
• eu
  eu

  abbreviation

  the European Union

Eu

¹ American  

Symbol, Chemistry.

1. europium.

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EU ² American  

[ee-yoo] / ˈiˈyu /

abbreviation

1. European Union.

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eu- ³ American  

1. a combining form meaning “good,” “well,” occurring chiefly in words of Greek origin (eupepsia ); in scientific coinages, especially taxonomic names, it often has the sense “true, genuine” (eukaryote )

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Eu ¹ British  

symbol

1. europium

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EU ² British  

abbreviation

1. European Union

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eu ³ British  

abbreviation

1. the European Union

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eu- ⁴ British  

combining form

1. well, pleasant, or good

   eupeptic

   euphony

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Etymology

Origin of eu-

< Greek, combining form of eús good (adj.) or eú, eû (neuter, used as adv.) well

Example Sentences

He warned the Albanian government to “refrain from action” that could undermine its effort to join the EU.

From The Wall Street Journal • Jun. 11, 2026

The biggest sector throwing money to influence EU policy-makers?

From Barron's • Jun. 10, 2026

Roberta Metsola, president of the European Parliament, said the EU learned to be “the boring partner” with the U.S. amid new trade duties.

From The Wall Street Journal • Jun. 10, 2026

Meanwhile, this week the EU is putting into force its Pact on Migration and Asylum, which introduces new asylum procedures.

From BBC • Jun. 10, 2026

Norway opted to stay out of the EU during a referendum in November 1994; nonetheless, as a member of the European Economic Area, it contributes sizably to the EU budget.

From The 2008 CIA World Factbook by United States. Central Intelligence Agency