There are 2 main definitions of Rn in English:

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Rn 1

symbol

The chemical element radon.

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Syllabification: Rn

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There are 2 main definitions of Rn in English:

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RN 2

Pronunciation: /ˌä ˈren/

abbreviation

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

For editors and proofreaders

Syllabification: RN

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