r

noun, often capitalized, often attributive
\ˈär \
plural r's or rs\ˈärz \

Definition of

(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 (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 (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 (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

Qyrghyz

qz

R

r

Ra

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 \
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

(Entry 1 of 3)

roentgen

Medical Definition of (Entry 2 of 3)

1 Reaumur

2 rough used in bacteriology

R

symbol

Medical Definition of (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 typical or ideal example

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

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!