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⇱ R, r - WordReference.com Dictionary of English


WordReference Random House Learner's Dictionary of American English © 2026
R, r /ɑr/USA pronunciation   n., pl. Rs or R's, rs or r's. 
  1. the 18th letter of the English alphabet, a consonant.

R,  an abbreviation of:
  1. Mathematicsratio.
  2. Biochemistry, Clothingregular: a man's suit or coat size.
  3. Show Businessrestricted: a motion-picture rating advising that children under the age of 17 will not be admitted unless accompanied by an adult. Compare G (def. 2),NC-17,PG,PG-13,X (def. 7).
  4. Show Businessright.

R,  [Symbol.]
  1. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
  2. Electronicsresistance.

r,  an abbreviation of:
  1. radius.

R.,  an abbreviation of:
  1. Mathematicsradius.
  2. Rail Transportrailroad.
  3. Rail Transportrailway.
  4. GovernmentRepublican.
  5. right.
  6. river.
  7. road.

r.,  an abbreviation of:
  1. Rail Transportrailroad.
  2. Rail Transportrailway.
  3. right.
  4. river.
  5. road.
  6. Weights and Measuresrod.

WordReference Random House Unabridged Dictionary of American English © 2026
R, r  (är),USA pronunciation n., pl. 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
  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. See three R's. 

R  (är),USA pronunciation 
  1. Informal Termsv. are:Oysters R in season.

R, 
    1. Chemistryradical.
    2. Mathematicsratio.
    3. Biochemistry, Clothingregular: a man's suit or coat size.
    4. Electricityresistance.
    5. Show Businessrestricted: 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. Cf. G (def. 7), PG, PG–13, X. [abbrev. for restricted]
    6. Show Business[Theat.]stage right.
    7. Physicsroentgen.
    8. Chessrook.

R,  Symbol.
  1. the 18th in order or in a series, or, when I is omitted, the 17th.
  2. (sometimes l.c.) the medieval Roman numeral for 80. Cf. Roman numerals. 
  3. Biochemistryarginine.
  4. [Physics.]See universal gas constant. 
  5. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

r, 
    1. radius.
    2. Business[Com.]registered (def. 2).
    3. [Elect.]resistance.
    4. Physicsroentgen.
    5. royal.
    6. Currencyruble.
    7. Currencypl. rs, rupee.

r, [Ecol.]
  1. Ecologythe 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. Judaismrabbi.
    2. Radical.
    3. Mathematicsradius.
    4. Rail Transportrailroad.
    5. Rail Transportrailway.
    6. Currency(in South Africa) rand;
      rands.
    7. Réaumur.
    8. DrugsAlso, R (in prescriptions) take.
    9. rector.
    10. redactor.
    11. regina.
    12. GovernmentRepublican.
    13. response.
    14. rex.
    15. river.
    16. road.
    17. royal.
    18. Currencyruble.
    19. Currencyrupee.
    20. Show Business[Theat.]stage right.

r., 
    1. rabbi.
    2. Rail Transportrailroad.
    3. Rail Transportrailway.
    4. range.
    5. rare.
    6. [Com.]received.
    7. recipe.
    8. replacing.
    9. residence.
    10. right.
    11. rises.
    12. river.
    13. road.
    14. Weights and Measuresrod.
    15. royal.
    16. rubber.
    17. Currencyruble.
    18. Sport[Baseball.]run;
      runs.
    19. Currencypl. rs. rupee.

'R, r' also found in these entries (note: many are not synonyms or translations):

Forum discussions with the word(s) "R, r" in the title:

'steer clear of' - pronunciation R (BrE)
(> r=.93)
(R-MD)
(R.E. V.C.)
(the) famous singer/songwriter R. Kelly
(πr)² – pi r all squared [AE]
[be careful with/watch out for] the R sound
[r] in a non-rhotic dialect to avoid ambiguity
/R/ sound between vowels (BE)
A ''R'' or ''An'' R
a certificate to support your responsibilities under IR(ME)R 2000? ( England )
A linking 'r' after they're, bfore a vowel sound
A.R.A. with more in prospect. Money? You roll in it, I suppose.
Abbreviation: T.O.R.
add R after a schwa [intrusive R in AE]
after you(r) getting out
Am E no R in songs
American "R"
an extra r has to be supplied
An R is for rain.
ANCILLARY RELIEF/CRIMINAL LAW: R v K [2009] EWCA Crim 1640
anti-drug <technology><technologies> R&D
Approximants /w, j, l, r/ [phonetics]
at or in R company
æ after r
Babies “R” Us will give a “personal registry advisor”
be unable to pronounce 'r' and 'l' properly
But R. still held out like the last stubborn survivor of a different city
Canadian R
Cheer up, Mas’r Davy bor’!
more...

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