R, r

[ ahr ]
/ ɑr /

noun, plural R's or Rs, r's or rs.

the 18th letter of the English alphabet, a consonant.
any spoken sound represented by the letter R or r, as in ran, carrot, or rhyme.
something having the shape of R.
a written or printed representation of the letter R or r.
a device, as a printer's type, for reproducing the letter R or r.

Definition for r (2 of 10)

r

Ecology.

the theoretical intrinsic rate of increase of a population, equivalent to the difference between the birth and death rates divided by the number of individuals in the population.
Also called Malthusian parameter.

Definition for r (3 of 10)

r

Definition for r (4 of 10)

R
[ ahr ]
/ ɑr /

verb

Informal. are: Oysters R in season.

Definition for r (5 of 10)

R

Symbol.

the 18th in order or in a series, or, when I is omitted, the 17th.
(sometimes lowercase) the medieval Roman numeral for 80. Compare Roman numerals.
Biochemistry. arginine.
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.

Definition for r (6 of 10)

R 1

restricted: a rating assigned to a motion picture by the Motion Picture Association of America indicating that children under the age of 17 will not be admitted unless accompanied by an adult. Compare G(def 7), PG, PG-13, X(def 8).

Origin of R

1
abbreviation for restricted

Definition for r (7 of 10)

R 2

Definition for r (8 of 10)

r.

Definition for r (9 of 10)

R. 1

or R.


(in prescriptions) take.

Origin of R.

1
From the Latin word recipe

Definition for r (10 of 10)

R. 2

Example sentences from the Web for r

British Dictionary definitions for r (1 of 5)

r

R

/ (ɑː) /

noun plural r's, R's or Rs

the 18th letter and 14th consonant of the modern English alphabet
a speech sound represented by this letter, in English usually an alveolar semivowel, as in red
See three Rs

British Dictionary definitions for r (2 of 5)

R

symbol for

British Dictionary definitions for r (3 of 5)

r.

abbreviation for

rare
recto
Also: r rod (unit of length)
ruled
cricket baseball run(s)

British Dictionary definitions for r (4 of 5)

R.

r.


abbreviation for

registered (trademark)
right
river
rouble

British Dictionary definitions for r (5 of 5)

R.

abbreviation for

Word Origin for R.

(sense 3) Latin: Queen (sense 6) Latin: King

Medical definitions for r (1 of 2)

r

abbr.

racemic

Medical definitions for r (2 of 2)

R

abbr.

right
radical (usually an alkyl or aryl group)
respiration
respiratory exchange ratio
or r roentgen

Scientific definitions for r (1 of 2)

r

Abbreviation of radius

Scientific definitions for r (2 of 2)

R

The symbol for resistance.

Idioms and Phrases with r

R

see three R's.