1. r

noun. ['ˈɑːr'] the 18th letter of the Roman alphabet.

Rhymes with R

• ahr
• ar
• r.

How do you pronounce r?

Pronounce r as ɑr.

US - How to pronounce r in American English

UK - How to pronounce r in British English

2. R._J._Mitchell

noun. English aeronautical engineer (1895-1937).

3. R._B._Cattell

noun. American psychologist (born in England) who developed a broad theory of human behavior based on multivariate research (1905-1998).

4. CD-R

noun. a compact disc on which you can write only once and thereafter is read-only memory.

5. R-2

noun. street names for flunitrazepan.

6. R._Buckminster_Fuller

noun. United States architect who invented the geodesic dome (1895-1983).

7. 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.

8. R

noun. the 18th letter of the Roman alphabet.

9. r

noun. ['ˈɑːr'] the length of a line segment between the center and circumference of a circle or sphere.

10. 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.