Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Rn

symbol

Definition of Rn

  1. radon




1

RN

play
noun \ˌär-ˈen\

Definition of RN




2

RN

abbreviation

Definition of RN

  1. Royal Navy




Medical Dictionary

Rn

symbol

Medical Definition of Rn

  1. radon




RN

play
noun \ˈär-ˈen\

Medical Definition of RN




Learn More about rn

  1. Medical Dictionary: Definition of "Rn" Britannica.com: Encyclopedia article about "Rn"


Seen and Heard

What made you want to look up Rn? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

spindrift kittly-benders duvet pince-nez
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ