There are 2 definitions of Rn in English:

Rn1

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symbol

The chemical element radon.

Definition of Rn 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 Rn in English:

RN2

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abbreviation

1Niger (international vehicle registration).
[from French République du Niger]
1.1(Chiefly in North America) Registered Nurse.
1.2(In the UK) Royal Navy.

Definition of Rn in: