There are 2 main definitions of Rn in English:

Rn1

Syllabification: Rn

symbol

The chemical element radon.

Definition of Rn in:

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There are 2 main definitions of Rn in English:

RN2

Syllabification: RN

abbreviation

1(Chiefly in North America) Registered Nurse.
1.1 (in the UK) Royal Navy.

Definition of Rn in: