There are 2 definitions of Rb in English:

Rb1

Line breaks: Rb

symbol

The chemical element rubidium.

Definition of Rb in:

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...

There are 2 definitions of Rb in English:

RB2

Line breaks: RB

abbreviation

Botswana (international vehicle registration).

Origin

from Republic of Botswana.