R, r

noun, plural R's or Rs, r's or rs.
  1. the 18th letter of the English alphabet, a consonant.
  2. any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme.
  3. something having the shape of R.
  4. a written or printed representation of the letter R or r.
  5. a device, as a printer's type, for reproducing the letter R or r.
  6. three R's.


  1. reis.
  2. rupees.


  1. right side.


  1. Recording Secretary.
  2. Reformed Spelling.
  3. Revised Statutes.
  4. Royal Society.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rs

Contemporary Examples of rs

Historical Examples of rs

British Dictionary definitions for rs


the internet domain name for
  1. Serbia


symbol for
  1. rupees


abbreviation for (in Britain)
  1. Royal Society
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

rs in Science


  1. Abbreviation of radius


  1. The symbol for resistance.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.