r

/ˈɑɹ/ · 1 syllable

Meaning

noun

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
2. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
3. the 18th letter of the Roman alphabet
4. the 18th letter of the Roman alphabet
5. the length of a line segment between the center and circumference of a circle or sphere

Synonyms for r

• roentgen
• gas constant
• universal gas constant
• radius

Words that rhyme with r

• bar
• star
• far
• dinar
• jar
• spar
• car
• char
• mar
• reservoir
• alar
• ar
• bazaar
• cinnabar
• par
• parr
• registrar
• scar
• tar
• avatar
• bazar
• czar
• gar
• lodestar
• memoir
• repertoire
• seminar
• sidebar
• abattoir
• afar