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R, r

[ahr] /ɑr/
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.

R

[ahr] /ɑr/
verb
1.
Informal. are :
Oysters R in season.

R1

1.
restricted: a rating assigned to a motion picture by the Motion Picture Association of America indicating that children under the age of 17 will not be admitted unless accompanied by an adult.
Compare G (def 7), PG, PG-13, X (def 8).
Origin
abbreviation for restricted

R2

1.
Chemistry, radical.
2.
Mathematics, ratio.
3.
regular: a man's suit or coat size.
4.
Electricity, resistance.
5.
Theater. stage right.
6.
Physics. roentgen.
7.
Chess. rook.

R

Symbol.
1.
the 18th in order or in a series, or, when I is omitted, the 17th.
2.
(sometimes lowercase) the medieval Roman numeral for 80.
Compare Roman numerals.
3.
Biochemistry, arginine.
4.
5.
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

r

1.
2.
Commerce, registered (def 2).
3.
Electricity, resistance.
4.
Physics. roentgen (def 2).
5.
6.
7.
plural rs, rupee.

r

Ecology
1.
the theoretical intrinsic rate of increase of a population, equivalent to the difference between the birth and death rates divided by the number of individuals in the population.
Also called Malthusian parameter.

R.1

1.
(in prescriptions) take.
Also, R.
Origin
< Latin recipe

R.2

1.
2.
3.
4.
5.
6.
(in South Africa) rand; rands.
7.
8.
9.
10.
11.
12.
13.
rex.
14.
15.
road.
16.
17.
18.
19.
Theater. stage right.

r.

1.
2.
3.
4.
5.
rare.
6.
Commerce, received.
7.
8.
replacing.
9.
10.
11.
rises.
12.
13.
road.
14.
rod.
15.
16.
17.
18.
Baseball. run; runs.
19.
plural rs. rupee.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for r

r

/ɑː/
noun (pl) r's, R's, Rs
1.
the 18th letter and 14th consonant of the modern English alphabet
2.
a speech sound represented by this letter, in English usually an alveolar semivowel, as in red
3.
See three Rs

R

symbol
1.
(chem) radical
2.
(currency)
  1. rand
  2. rupee
3.
Réaumur temperature (scale)
4.
(physics, electronics) resistance
5.
roentgen or röntgen
6.
(chess) rook
7.
Royal
8.
(chem) gas constant
9.
(in the US and Australia)
  1. restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18)
  2. (as modifier) an R film

r.

abbreviation
1.
rare
2.
recto
3.
Also r. rod (unit of length)
4.
ruled
5.
(cricket, baseball) run(s)

R.

abbreviation
1.
registered (trademark)
2.
right
3.
river
4.
rouble

R.

abbreviation
1.
rabbi
2.
rector
3.
Regina
4.
Republican
5.
response (in Christian liturgy)
6.
Rex
7.
River
8.
Royal
Word Origin
(sense 3) Latin: Queen(sense 6) Latin: King
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
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Word Origin and History for r
R
In a circle, meaning "registered (trademark)," first incorporated in U.S. statues 1946. Three Rs (1825) said to have been given as a toast by Sir W. Curtis (1752-1829). R&R "rest and relaxation," first recorded 1953, Amer.Eng.; R&B "rhythm and blues" (type of popular music) first attested 1949, Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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r in Medicine

r abbr.
racemic

R abbr.

  1. radical (usually an alkyl or aryl group)

  2. respiration

  3. respiratory exchange ratio

  4. or r roentgen

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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r in Science
r  
Abbreviation of radius
R  
The symbol for resistance.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for r

r

  1. correlation coefficient
  2. radius
  3. resistance

R

  1. gas constant
  2. radical
  3. rain
  4. range
  5. Réaumur
  6. receiver
  7. registered trademark
  8. Republican
  9. response
  10. restricted (children under 17 must be accompanied by a parent or guardian)
  11. right
  12. roentgen
  13. rook
  14. run

r.

  1. rare
  2. recto
  3. reigned
  4. retired
  5. rod
  6. rubber
  7. ruble
  8. rupee

R.

  1. patented
  2. rabbi
  3. received as transmitted (shortwave transmission)
  4. rector
  5. registered
  6. Latin rex (king)
  7. Latin regina (queen)
  8. river
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Idioms and Phrases with r
see: three R's
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for r

R

unit of X-radiation or gamma radiation, the amount that will produce, under normal conditions of pressure, temperature, and humidity, in 1 kg (2.2 lbs) of air, an amount of positive or negative ionization equal to 2.58104 coulomb. It is named for the German physicist Wilhelm Conrad Rontgen. See also rem.

Learn more about R with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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