Definition of R in English :

Define R in English

R meaning in English

Meaning of R in English

Pronunciation of R in English

R pronunciation in English

Pronounce R in English

R

see synonyms of r

Noun

1. r, roentgen

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, r, universal gas constant

(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

the 18th letter of the Roman alphabet

4. r, radius

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

WordNet Lexical Database for English. Princeton University. 2010.


R

see synonyms of r
nounWord forms: plural 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
3.  three Rs
symbol for
1. chemistry
radical
2. currency
a. 
rand
b. 
rupee
3. 
Réaumur temperature (scale)
4. physics, electronics
resistance
5. 
roentgen or röntgen
6. chess
rook
7. 
Royal
8. chemistry
gas constant
9. (in the US and Australia)
a. 
restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18)
b. 
(as modifier)
an R film
abbreviation for
1. 
rare
2. 
recto
3. Also: r
rod (unit of length)
4. 
ruled
5. cricket, baseball
run(s)
abbreviation for
1. 
registered (trademark)
2. 
right
3. 
river
4. 
rouble
abbreviation for
1. 
rabbi
2. 
rector
3. 
Regina
4. 
Republican
5. 
response (in Christian liturgy)
6. 
Rex
7. 
River
8. 
Royal

Collins English Dictionary. Copyright © HarperCollins Publishers


R

see synonyms of r
trademark
a film rating meaning “restricted”: it indicates that persons under seventeen may be admitted to the film only when accompanied by a parent or adult guardian
1. 
king
2. 
queen
3. 
Rabbi
4.  Chemistry
radical, esp. organic radical
5. 
Rankine
6.  Ancient Mathematics
ratio
7. 
Reaumur
8. 
registered (trademark)
symbol, ®
9. 
Republican
10.  Electricity
resistance
11. 
right
12. 
River
13. 
Road
14. 
roentgen(s)
15.  Chess
rook
16. 
route
17. 
ruble
18.  Baseball
run(s)
19. 
rupee
20.  Pharmacy
take: also ℞
molar gas constant
nounWord forms: plural R's or r's
1. 
the eighteenth letter of the English alphabet: from the Greek rho, a borrowing from the Phoenician
2. 
any of the speech sounds that this letter represents, as, in English, the (r) of rude
3. 
a type or impression for r or R
4. 
the eighteenth in a sequence or group
5. 
an object shaped like R
adjective
6. 
of r or R
7. 
eighteenth in a sequence or group
8. 
shaped like R
1. 
radius
2. 
range
3. 
rare
4. 
received
5.  Printing
recto
6. 
retired
7. 
right
8. 
rod(s)
9. 
roentgen(s)
10.  Cards
rubber
11.  Baseball
run(s)

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.


R

see synonyms of r
A trademark for a movie rating indicating that admission will be granted only to persons of or over a certain age, usually 17, unless accompanied by a parent or guardian.
n. pl. r's or R's also rs or Rs
1. The 18th letter of the modern English alphabet.
2. Any of the speech sounds represented by the letter r.
3. The 18th in a series.
4. Something shaped like the letter R.
1. The symbol for gas constant.
2. The symbol for a hydrocarbon side chain or substituent of variable chemical structure.
abbr.
1. Mathematics radius
2. Genetics recombinant
3. or R Electricity resistance
abbr.
1. range (surveying)
2. Réaumur (scale)
3. registered trademark
4. Republican
5. Ecclesiastical response
6. right
7. or r roentgen
8. rook (chess)
9. Baseball run
abbr.
1. rabbi
2. rector
3. river
abbr.
1. rare
2. retired
3. rod (unit of length)
4. ruble
5. rupee

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.