R, r

[ ahr ]

/ ɑr /

noun, plural R's or Rs, r's or rs.

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

any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme.

something having the shape of R.

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

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

three R's.

Definition for r (2 of 10)

Ecology.

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.

Definition for r (3 of 10)

radius.

Commerce. registered(def 2).

Electricity. resistance.

Physics. roentgen(def 2).

royal.

ruble.

plural rs, rupee.

Definition for r (4 of 10)

[ ahr ]

/ ɑr /

verb

Informal. are: Oysters R in season.

Definition for r (5 of 10)

Symbol.

the 18th in order or in a series, or, when I is omitted, the 17th.

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

Biochemistry. arginine.

Physics. universal gas constant.

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

Definition for r (6 of 10)

R¹

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 of R

abbreviation for restricted

Definition for r (7 of 10)

R²

Chemistry. radical.

Mathematics. ratio.

regular: a man's suit or coat size.

Electricity. resistance.

Theater. stage right.

Physics. roentgen.

Chess. rook.

Definition for r (8 of 10)

Commerce. received.

replacing.

rises.

Baseball. run; runs.

plural rs. rupee.

Definition for r (9 of 10)

R.¹

or R.

(in prescriptions) take.

Origin of R.

From the Latin word recipe

Definition for r (10 of 10)

R.²

(in South Africa) rand; rands.

Theater. stage right.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for r

Now that Collette had left La Domaine, who was she a slave to, Collette or R?
Dungeons and Genital Clamps: Inside a Legendary BDSM Chateau|Ian Frisch|December 20, 2014|DAILY BEAST
After a stint with a replacement Head Mistress went sour, R seriously considered shutting down La Domaine for good.
Dungeons and Genital Clamps: Inside a Legendary BDSM Chateau|Ian Frisch|December 20, 2014|DAILY BEAST
“[It was basically] a room with no view,” as R metaphorically put it.
Dungeons and Genital Clamps: Inside a Legendary BDSM Chateau|Ian Frisch|December 20, 2014|DAILY BEAST
At the time Kristina still could not quite pronounce the "R" sound in Russian, but she made her meaning clear.
Is 9-Year-Old Russian Model Kristina Pimenova Too Sexualized?|Anna Nemtsova|December 12, 2014|DAILY BEAST

But recently, the MPAA has loosened the stick in its collective ass and allowed women to go there whilst maintaining an R rating.
Oral Sex Comes of Age in Hollywood: ‘Gone Girl’ the Latest Film to Showcase Female Pleasure|Marlow Stern|October 4, 2014|DAILY BEAST
She would be forced to go to the Double R now, there was nothing else that she could do.
The Trail to Yesterday|Charles Alden Seltzer
R, as Weymouth translates it, “The heartfelt supplication of a righteous man exerts a mighty influence.”
My Daily Meditation for the Circling Year|John Henry Jowett
A barrel, R, can be filed or cut from a small piece of wood or cork, or it may be a small reel.
Toy-Making in School and Home|Ruby Kathleen Polkinghorne and Mabel Irene Rutherford Polkinghorne
Next time the I will carry off the first prize, and R the second.
The Sand-Hills of Jutland|Hans Christian Andersen
On the pendulum he had a little ratchet wheel, R, having thirty teeth.
Scientific American Supplement, No. 664, September 22,1888|Various

British Dictionary definitions for r (1 of 5)

R

/ (ɑː) /

noun plural r's, R's or Rs

the 18th letter and 14th consonant of the modern English alphabet

a speech sound represented by this letter, in English usually an alveolar semivowel, as in red

See three Rs

British Dictionary definitions for r (2 of 5)

symbol for

chem radical

currency

rand
rupee

Réaumur temperature (scale)

physics electronics resistance

roentgen or röntgen

chess rook

Royal

chem gas constant

(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)

abbreviation for

rare

recto

Also: r rod (unit of length)

ruled

cricket baseball run(s)

British Dictionary definitions for r (4 of 5)

r.

abbreviation for

registered (trademark)

right

river

rouble

British Dictionary definitions for r (5 of 5)

abbreviation for

rabbi

rector

Regina

Republican

response (in Christian liturgy)

Rex

River

Royal

Word Origin for R.

(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

Medical definitions for r (1 of 2)

abbr.

racemic

Medical definitions for r (2 of 2)

abbr.

right

radical (usually an alkyl or aryl group)

respiration

respiratory exchange ratio

or r roentgen

Scientific definitions for r (1 of 2)

Abbreviation of radius

Scientific definitions for r (2 of 2)

The symbol for resistance.

Idioms and Phrases with r

see three R's.