r

noun, often capitalized, often attributive
\ ˈär How to pronounce r (audio) \
plural r's or rs\ ˈärz How to pronounce rs (audio) \

Definition of r

 (Entry 1 of 4)

1a : 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

abbreviation (1)

Definition of r (Entry 2 of 4)

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

abbreviation (2)

Definition of R (Entry 3 of 4)

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

Definition of R (Entry 4 of 4)

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

Examples of r in a Sentence

Noun

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

First Known Use of r

Noun

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

Keep scrolling for more

Learn More about r

Dictionary Entries near r

qy

Qyrghyz

qz

r

R

Ra

RA

Statistics for r

Look-up Popularity

Time Traveler for r

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

See more words from the same century

Keep scrolling for more

More Definitions for r

r

noun

English Language Learners Definition of r

: the 18th letter of the English alphabet

r

noun, often capitalized
\ ˈär How to pronounce r (audio) \
plural r's or rs\ ˈärz \

Kids Definition of r

: the 18th letter of the English alphabet

Kids Definition of r.

right

Kids Definition of R

regular

Kids Definition of R.

rabbi

Medical Definition of r

 (Entry 1 of 3)

roentgen

Medical Definition of R (Entry 2 of 3)

1 Reaumur
2 rough used in bacteriology

R

symbol

Medical Definition of R (Entry 3 of 3)

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

Keep scrolling for more

More from Merriam-Webster on r

Spanish Central: Translation of r

Nglish: Translation of r for Spanish Speakers

Britannica.com: Encyclopedia article about r

Comments on r

What made you want to look up r? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a strong desire or propensity

Get Word of the Day daily email!

Test Your Vocabulary

Challenging Vocabulary Quiz Returns!

  • stylized drawing of woman pole vaulting across gap to get trophy
  • Which is a synonym of fuliginous?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!