1. registered nurse.
  2. British. Royal Navy.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rn

Contemporary Examples of rn

Historical Examples of rn

  • Tod says that almost all the princes of Rjastn followed the Rn at Kanw.

    The Bbur-nma in English

    Babur, Emperor of Hindustan

  • Rn Ronsard accepted it with a slight but not over-obsequious salutation.

    Temporal Power

    Marie Corelli

  • He has spoken often to our people, and he is father Rn's friend.

    Temporal Power

    Marie Corelli

  • She was daughter to Rn, who was a relation of the King of France.

  • Rn preceded her, and in a few minutes they stood in the perfumer's shop.

    Marguerite de Valois

    Alexandre Dumas

British Dictionary definitions for rn


the chemical symbol for
  1. radon


abbreviation for
  1. (in Canada) Registered Nurse
  2. Royal Navy
symbol for
  1. Niger (international car registration)

Word Origin for RN

(sense 3) From R(epublic of) N(iger)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

rn in Medicine


  1. The symbol for the elementradon


  1. registered nurse
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

rn in Science


  1. The symbol for radon.


  1. A colorless, odorless, radioactive element in the noble gas group. It is produced by the radioactive decay of radium and occurs in minute amounts in soil, rocks, and the air near the ground. Radon is used as a source of radiation for the treatment of cancer and other diseases. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.8°C; specific gravity (solid) 4. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.