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noun, plural R's or Rs, r's or rs.
1.
the 18th letter of the English alphabet, a consonant.
2.
3.
something having the shape of R.
4.
a written or printed representation of the letter R or r.
5.
EXPANDa device, as a printer's type, for reproducing the letter R or r.
Example Sentences
- If u r not convinced wif the above statement, be optimistic.
- R ather coarse looking, but valuable for profuse late summer and autumn bloom.
- Nobody likes to watch a former master get pummeled, humiliated and r.
Dictionary.com Unabridged
verb
R
1.
Chemistry. radical.
2.
Mathematics. ratio.
3.
regular: a man's suit or coat size.
4.
Electricity. resistance.
5.
EXPANDR
Symbol.
1.
the 18th in order or in a series, or, when I is omitted, the 17th.
2.
(sometimes lowercase) the medieval Roman numeral for 80. Compare Roman numerals.
3.
Biochemistry. arginine.
4.
Physics. universal gas constant.
5.
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
r
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.
R.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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|
Link To R
Collins
World English Dictionary
| r or R (ɑː) | |
| —n , pl r's, R's, Rs | |
| 1. | the 18th letter and 14th consonant of the modern English alphabet |
| 2. | a speech sound represented by this letter, in English usually an alveolar semivowel, as in red |
| 3. | See three Rs |
| R or R | |
| —n | |
| r or R (ɑː) | |
| —n , pl r's, R's, Rs | |
| 1. | the 18th letter and 14th consonant of the modern English alphabet |
| 2. | a speech sound represented by this letter, in English usually an alveolar semivowel, as in red |
| 3. | See three Rs |
| R or R | |
| —n | |
| R | |
| —symbol for | |
| 1. | chem radical |
| 2. | currency |
| a. rand | |
| b. rupee | |
| 3. | Réaumur temperature (scale) |
| 4. | physics, electronics resistance |
| 5. | roentgen or röntgen |
| 6. | chess rook |
| 7. | Royal |
| 8. | chem gas constant |
| 9. | in the US and Australia |
| a. restricted exhibition (used to describe a category of film certified as unsuitable for viewing by anyone under the age of 18) | |
| b. (as modifier): an R film | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
R
In a circle, meaning "registered (trademark)," first incorporated in U.S. statues 1946. Three Rs (1825) said to have been given as a toast by Sir W. Curtis (1752-1829). R&R "rest and relaxation," first recorded 1953, Amer.Eng.; R&B "rhythm and blues" (type of popular music) first attested 1949, Amer.Eng.
EXPANDCOLLAPSE
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
r abbr.
racemic
R abbr.
radical (usually an alkyl or aryl group)
respiration
respiratory exchange ratio
or r roentgen
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
| r
Abbreviation of radius |
| R
The symbol for resistance. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
r
|
R
|
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Copyright © 1997. Published by Houghton Mifflin.
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Encyclopedia Britannica
Encyclopedia
R
unit of X-radiation or gamma radiation, the amount that will produce, under normal conditions of pressure, temperature, and humidity, in 1 kg (2.2 lbs) of air, an amount of positive or negative ionization equal to 2.58104 coulomb. It is named for the German physicist Wilhelm Conrad Rontgen. See also rem.
Learn more about R with a free trial on Britannica.com.
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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