Definition of R in English :
Define R in English
R meaning in English
Meaning of R in English
Pronunciation of R in English
R pronunciation in English
Pronounce R in Englishsee synonyms of r
1. r, roentgen
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
the 18th letter of the Roman alphabet
4. r, radius
the length of a line segment between the center and circumference of a circle or sphere
WordNet Lexical Database for English. Princeton University. 2010.
Collins English Dictionary. Copyright © HarperCollins Publishers
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.
The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.