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)
Definition for r (5 of 10)
R
Symbol.
the 18th in order or in a series, or, when I is omitted, the 17th.
Biochemistry.
arginine.
Physics.
universal gas constant.
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
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.