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r
1 r noun
or R /ˈɑɚ/
plural r's or rs or R's or Rs
1 r
noun
or R /ˈɑɚ/
plural r's or rs or R's or Rs
Learner's definition of R
: the 18th letter of the English alphabet英语字母表的第18个字母
[count]
[noncount]
— see also three r's

roll your r's

— see 1roll
2 r abbreviation
2 r
abbreviation
Learner's definition of R
1 
radius
2 
or R right

R
1 R /ˈɑɚ/
1 R
/ˈɑɚ/
Learner's definition of R
— used as a special mark to indicate that people over the age of 17 or 18 may see a particular movie but that younger people may only see the movie in a movie theater with a parent or guardian*R级（影片分级用语，17或18岁以下青少年须由父母或监护人陪同才能观看的电影的标记）
— compare g, nc-17, pg, pg-13, x; see also r-rated
2 R abbreviation
2 R
abbreviation
Learner's definition of R
1 
registered trademark注册商标
2 
Republican
3 
R. river

r

1 of 4

noun

ˈär How to pronounce r (audio)
plural r's or rs ˈärz How to pronounce r (audio)
often capitalized, often attributive
1
a
: the 18th letter of the English alphabet
b
: a graphic representation of this letter
c
: a speech counterpart of orthographic r
2
: a graphic device for reproducing the letter r
3
: one designated r especially as the 18th in order or class
4
: something shaped like the letter R

r

2 of 4

abbreviation (1)

1
radius
2
rain
3
range
4
rare
5
real
6
recto
7
red
8
repeat
9
rerun
10
resistance
11
right
12
roentgen
13
rook
14
rough
15
run

R

3 of 4

abbreviation (2)

1
rabbi
2
radial
3
radical
—used especially of a monovalent hydrocarbon radical
4
Rankine
5
Reaumur
6
recipe
7
registered trademark
—often enclosed in a circle
8
regular
9
Republican
10
river
11
R-value

R

4 of 4

certification mark

—used to certify that a motion picture is of such a nature that admission is restricted to persons over a specified age (such as 17) unless accompanied by a parent or guardian compare g, nc-17, pg, pg-13

Example Sentences

Noun There are two r's in “tomorrow.” “River” begins and ends with r.

Word History

First Known Use

Noun

before the 12th century, in the meaning defined at sense 1a

Time Traveler
The first known use of r was before the 12th century

Phrases Containing r

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