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R
1or r
[ ahr ]
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.
R.
2or R.
abbreviation for
- (in prescriptions) take.
R
3[ ahr ]
verb
- Informal. are:
Oysters R in season.
R.
4abbreviation for
- rabbi.
- Radical.
- radius.
- railroad.
- railway.
- (in South Africa) rand; rands.
- Réaumur.
- rector.
- redactor.
- regina.
- Republican.
- response.
- rex.
- river.
- road.
- royal.
- ruble.
- rupee.
- Theater. stage right.
R
5abbreviation for
- 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
6abbreviation for
- Chemistry. radical.
- Mathematics. ratio.
- regular: a man's suit or coat size.
- Electricity. resistance.
- Theater. stage right.
- Physics. roentgen.
- Chess. rook.
R
7Symbol.
- the 18th in order or in a series.
- (sometimes lowercase) the medieval Roman numeral for 80. Compare Roman numerals.
- Biochemistry. arginine ( def ).
- Physics. universal gas constant.
- registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
r
8Ecology.
- 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
9abbreviation for
, plural rs,
- Commerce. registered ( def 2 ).
- Electricity. resistance.
- Physics. roentgen ( def 2 ).
- plural rs rupee.
r.
10abbreviation for
, plural rs.
- rabbi.
- railroad.
- railway.
- range.
- rare.
- Commerce. received.
- recipe.
- replacing.
- residence.
- right.
- rises.
- river.
- road.
- rod.
- royal.
- rubber.
- ruble.
- Baseball. run; runs.
- plural rs rupee.
R.
1abbreviation for
- registered (trademark)
- right
- river
- rouble
R.
2abbreviation for
- rabbi
- rector
- Regina
- Republican
- response (in Christian liturgy)
- Rex
- River
- Royal
r.
3abbreviation for
- rare
- recto
- Alsor rod (unit of length)
- ruled
- cricket baseball run(s)
R
4symbol 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
r
5/ ɑː /
noun
- 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
r
- Abbreviation of radius
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Word History and Origins
Origin of R1
From the Latin word recipe
Origin of R2
An American designation established in 1968
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Word History and Origins
Origin of R1
(sense 3) Latin: Queen
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Idioms and Phrases
see three R's .Advertisement
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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