Dictionary Results for r

1. r - noun

· a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

Synonym(s): roentgen, R

Hypernym(s): radioactivity_unit

2. r - noun

· (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

Synonym(s): gas_constant, universal_gas_constant, R

Hypernym(s): constant

3. r - noun

· the 18th letter of the Roman alphabet

Synonym(s): R

Hypernym(s): letter, letter_of_the_alphabet, alphabetic_character

4. r - noun

· the length of a line segment between the center and circumference of a circle or sphere

Synonym(s): radius

Hypernym(s): length

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