iDictionary
Free Online English Dictionary
Find Definition:  
Dictionary
Please select the first letter in the word you are seeking (Example: select 'r' for 'reform').
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
Dictionary definition for the word r
r (noun)
4 definitions

1: a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air [syn: roentgen]
2: (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole [syn: gas constant, universal gas constant]
3: the 18th letter of the Roman alphabet
4: the length of a line segment between the center and circumference of a circle or sphere [syn: radius]
Do you need more info about r, find it at iReference.ca
 
© 2008 - 2010 iDictionary.ca All Rights Reserved.