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1. R
regular: a man's suit or coat size.
2. R
restricted: a motion-picture rating advising that children under 17 will not be admitted unless accompanied by an adult.
3. R
right.
4. R
roentgen.
5. R
the 18th in order or in a series.
6. R
arginine.
7. R
registered trademark: written as superscript ® following a name registered with the U.S. Patent and Trademark Office.
8. r
radius.
9. r
roentgen.
10. r
royal.
11. r
ruble.
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| Definition of 'r' |
Princeton's WordNet |
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1. (noun) roentgen, R
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
2. (noun) gas constant, universal gas constant, R
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
3. (noun) R, r
the 18th letter of the Roman alphabet
4. (noun) radius, r
the length of a line segment between the center and circumference of a circle or sphere
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1. (noun) r
the 18th letter of the alphabet
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| Definition of 'r' |
Webster Dictionary |
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1. r
r, the eighteenth letter of the English alphabet, is a vocal consonant. It is sometimes called a semivowel, and a liquid. See Guide to Pronunciation, // 178, 179, and 250-254
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| Definition of 'r' |
The Standard Electrical Dictionary |
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1. r
(a) Abbreviation and symbol for Reamur, as 10º R., meaning 10º by the Reamur thermometer. (See Reamur Scale.)
(b) Symbol for resistance, as in the expression of Ohm's Law C=E. (rho, Greek r) Symbol for specific resistance.
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Definitions of r 
