There are 2 definitions of Ru in English:

Ru1

Line breaks: Ru

symbol

The chemical element ruthenium.

Definition of Ru in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music

There are 2 definitions of Ru in English:

RU2

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abbreviation

1 informal Are you? where RU?
1.1Burundi (international vehicle registration).
[from Ruanda-Urundi (now Rwanda and Burundi)]
1.2Rugby union.