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 .

Words Nearby r

Other definitions for r (2 of 10)

r

abbreviation
  1. Electricity. resistance.

  2. plural rs, rupee.

Other definitions for R (3 of 10)

R1

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.

  1. something having the shape of R.

  2. a written or printed representation of the letter R or r.

  3. a device, as a printer's type, for reproducing the letter R or r.

Other definitions for R (4 of 10)

R2
[ ahr ]

verb
  1. Informal. are: Oysters R in season.

Other definitions for R (5 of 10)

R3

abbreviation
  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 G3, NC-17, PG1, PG-13.

Origin of R

5
An American designation established in 1968

Other definitions for R (6 of 10)

R4

abbreviation
  1. Chemistry. radical.

  2. Mathematics. ratio.

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

  2. Electricity. resistance.

  3. Theater. stage right.

  4. Physics. roentgen.

  5. Chess. rook.

Other definitions for R (7 of 10)

R5

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

  2. (sometimes lowercase) the medieval Roman numeral for 80.: Compare Roman numerals.

  1. Biochemistry. arginine.

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

Other definitions for r. (8 of 10)

r.

abbreviation
  1. rabbi.

  2. railroad.

  1. railway.

  2. range.

  3. rare.

  4. Commerce. received.

  5. recipe.

  6. replacing.

  7. residence.

  8. right.

  9. rises.

  10. river.

  11. road.

  12. rod.

  13. royal.

  14. rubber.

  15. ruble.

  16. Baseball. run; runs.

  17. plural rs. rupee.

Other definitions for R. (9 of 10)

R.1

abbreviation
  1. (in prescriptions) take.

Origin of R.

9
From the Latin word recipe

Other definitions for R. (10 of 10)

R.2

abbreviation
  1. rabbi.

  2. Radical.

  1. radius.

  2. railroad.

  3. railway.

  4. (in South Africa) rand; rands.

  5. Réaumur.

  6. rector.

  7. redactor.

  8. regina.

  9. Republican.

  10. response.

  11. rex.

  12. river.

  13. road.

  14. royal.

  15. ruble.

  16. rupee.

  17. Theater. stage right.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use r in a sentence

British Dictionary definitions for r (1 of 5)

r

R

/ (ɑː) /


nounplural r's, R's or 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

British Dictionary definitions for R (2 of 5)

R

symbol for
  1. chem radical

  2. currency

    • rand

    • rupee

  1. Réaumur temperature (scale)

  2. physics electronics resistance

  3. roentgen or röntgen

  4. chess rook

  5. Royal

  6. chem gas constant

  7. (in the US and Australia)

    • restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18)

    • (as modifier): an R film

British Dictionary definitions for r. (3 of 5)

r.

abbreviation for
  1. rare

  2. recto

  1. Also: r rod (unit of length)

  2. ruled

  3. cricket baseball run(s)

British Dictionary definitions for R. (4 of 5)

R.

abbreviation for
  1. registered (trademark)

  2. right

  1. river

  2. rouble

British Dictionary definitions for R. (5 of 5)

R.

abbreviation for
  1. rabbi

  2. rector

  1. Regina

  2. Republican

  3. response (in Christian liturgy)

  4. Rex

  5. River

  6. Royal

Origin of R.

5
(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

Scientific definitions for r (1 of 2)

r

  1. Abbreviation of radius

Scientific definitions for R (2 of 2)

R

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

Other Idioms and Phrases with r

r

see three R's.

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