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⇱ R Definition & Meaning - Merriam-Webster

Dictionary Definition
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variants often R
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 β€”used especially of a monovalent hydrocarbon radical
4
Rankine
5
Reaumur
6
recipe
7
registered trademark β€”often enclosed in a circle
8
regular
9
Republican
10
river
11
R-value
β€”used to certify that a movie 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
πŸ‘ Image

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Words Starting With R

Browse 16,749 words and phrases that start with the letter R, from Ra to rytina.

Examples of r in a Sentence

Noun There are two r's in β€œtomorrow.” β€œRiver” 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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Cite this Entry

β€œR.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/r. Accessed 7 Apr. 2026.

Kids Definition

r

1 of 2 noun
ˈÀr
often capitalized
: the 18th letter of the English alphabet

R

2 of 2 certification mark
β€”used to certify that a motion picture is of such a nature that admission is restricted to persons over a specified age (as 17) unless accompanied by a parent or guardian

Medical Definition

r

1 of 3 abbreviation
roentgen

R

2 of 3 abbreviation
1
Reaumur
2
rough β€”used in bacteriology

R

3 of 3 symbol
chemical group and especially an organic chemical group
thiols have the general formula RSH

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Merriam-Webster unabridged

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