Definitions for r

This page provides all possible meanings and translations of the word r

Random House Webster's College Dictionary

R, rɑr(n.)(pl.)Rs; R's, rs; r's.

  1. the 18th letter of the English alphabet, a consonant.

  2. any spoken sound represented by this letter.

  3. something shaped like anR.

  4. a written or printed representation of the letter R or



  1. Chem.radical.

    Category: Chemistry

  2. Math.ratio.

    Category: Math

  3. regular: a man's suit or coat size.

    Category: Biochemistry, Clothing

  4. restricted: a motion-picture rating advising that children under 17 will not be admitted unless accompanied by an adult.

    Category: Showbiz

    Ref: Compare G (def. 2), 3 5 NC-17 , PG, 2 PG-13, 3 X (def. 7). 4 8

  5. right.

    Category: Showbiz

  6. roentgen.

    Category: Physics


  1. the 18th in order or in a series.

  2. arginine.

    Category: Biochemistry

  3. registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

  4. Elect.resistance.

    Category: Electronics

* Symbol..


  1. radius.

  2. Elect.resistance.

  3. roentgen.

    Category: Physics

  4. royal.

  5. ruble.

    Category: Numismatics

  6. Category: Numismatics


  1. the 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.

    Category: Ecology

    Ref: Also called Malthusian parameter.

* Ecol..


  1. rabbi.

    Category: Judaism

  2. Radical.

  3. radius.

    Category: Math

  4. railroad.

    Category: Railroads

  5. railway.

    Category: Railroads

  6. (in South Africa) rand.

    Category: Numismatics

  7. Réaumur.

  8. Also, R (in prescriptions) take.

    Category: Pharmacology

  9. rector.

  10. Regina.

  11. Republican.

    Category: Government

  12. Eccles. response.

  13. Rex.

  14. right.

  15. river.

  16. road.

  17. royal.

  18. ruble.

    Category: Numismatics

  19. rupee.

    Category: Numismatics

Origin of R.:

< L recipe


  1. rabbi.

  2. railroad.

    Category: Railroads

  3. railway.

    Category: Railroads

  4. range.

  5. rare.

  6. Com. received.

  7. recipe.

  8. replacing.

  9. right.

  10. river.

  11. road.

  12. rod.

    Category: Weights and Measures

  13. royal.

  14. rubber.

  15. ruble.

    Category: Numismatics

  16. Baseball. run.

    Category: Sport

  17. Category: Numismatics

Princeton's WordNet

  1. roentgen, R(noun)

    a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

  2. gas constant, universal gas constant, R(noun)

    (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

  3. R, r(noun)

    the 18th letter of the Roman alphabet

  4. radius, r(noun)

    the length of a line segment between the center and circumference of a circle or sphere

Kernerman English Learner's Dictionary

  1. r(noun)ˈɑɑr

    the 18th letter of the alphabet

Webster Dictionary

  1. R

    r, the eighteenth letter of the English alphabet, is a vocal consonant. It is sometimes called a semivowel, and a liquid. See Guide to Pronunciation, // 178, 179, and 250-254


  1. R

    R is the eighteenth letter of the ISO basic Latin alphabet.

The Standard Electrical Dictionary

  1. R

    (a) Abbreviation and symbol for Reamur, as 10º R., meaning 10º by the Reamur thermometer. (See Reamur Scale.) (b) Symbol for resistance, as in the expression of Ohm's Law C=E. (rho, Greek r) Symbol for specific resistance.


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