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R

1
or r

[ ahr ]

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.


R.

2
or R.

abbreviation for

  1. (in prescriptions) take.

R

3

[ ahr ]

verb

  1. Informal. are:

    Oysters R in season.

R.

4

abbreviation for

  1. rabbi.
  2. Radical.
  3. radius.
  4. railroad.
  5. railway.
  6. (in South Africa) rand; rands.
  7. Réaumur.
  8. rector.
  9. redactor.
  10. regina.
  11. Republican.
  12. response.
  13. rex.
  14. river.
  15. road.
  16. royal.
  17. ruble.
  18. rupee.
  19. Theater. stage right.

R

5

abbreviation for

  1. Trademark. restricted: a rating assigned to a movie by the MPA indicating that children under the age of 17 will not be admitted to a theater showing the film unless accompanied by an adult. Compare G 3( def ), NC-17, PG 1, PG-13.

R

6

abbreviation for

  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

7
Symbol.
  1. the 18th in order or in a series.
  2. (sometimes lowercase) the medieval Roman numeral for 80. Compare Roman numerals.
  3. Biochemistry. arginine ( def ).
  4. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

r

8
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.

r

9

abbreviation for

, plural rs,
  1. Electricity. resistance.
  2. plural rs rupee.

r.

10

abbreviation for

, plural rs.
  1. rabbi.
  2. railroad.
  3. railway.
  4. range.
  5. rare.
  6. Commerce. received.
  7. recipe.
  8. replacing.
  9. residence.
  10. right.
  11. rises.
  12. river.
  13. road.
  14. rod.
  15. royal.
  16. rubber.
  17. ruble.
  18. Baseball. run; runs.
  19. plural rs rupee.

R.

1

abbreviation for

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


R.

2

abbreviation for

  1. rabbi
  2. rector
  3. Regina
  4. Republican
  5. response (in Christian liturgy)
  6. Rex
  7. River
  8. Royal
“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

r.

3

abbreviation for

  1. rare
  2. recto
  3. Alsor rod (unit of length)
  4. ruled
  5. cricket baseball run(s)
“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

R

4

symbol for

  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

“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

r

5

/ ɑː /

noun

  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
“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

r

  1. Abbreviation of radius


Discover More

Word History and Origins

Origin of R1

From the Latin word recipe

Origin of R2

An American designation established in 1968
Discover More

Word History and Origins

Origin of R1

(sense 3) Latin: Queen
Discover More

Idioms and Phrases

see three R's .

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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