r
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
How often you will meet it
Rank 1,793 of 81,628 words measured. It occurs 38,102 times across 191,625 published chapters — 0.005% of every word in the library.
What it means
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 also: roentgen
- (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole also: gas constant, universal gas constant
- the 18th letter of the Roman alphabet
- the length of a line segment between the center and circumference of a circle or sphere also: radius
r in real books
Each sentence below was written by a published author and is taken from a different book in our library. Open one to read the passage it came from, with narration.
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I'm afraid he's out o' coal, 'r sick, 'r somethin'.
A Little Norsk · Hamlin Garland · Chapter 1
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In the end James R. Osgood failed, though all his enterprises succeeded.
Literary Boston as I Knew It · William Dean Howells · Chapter 1
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Mon coeur est un luth suspendu: Sitôt qu'on le touche, il résonne.
The Advance of English Poetry in · William Lyon Phelps · Chapter 2
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Q was a Queen, who was fond of good flip, R was a Robber, and wanted a whip.
The Nursery Rhyme Book · Andrew [Editor] Lang · Chapter 1
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Nannie Slade Hunter (Mrs. Edward R.) was their second-best friend and they had been among her bridesmaids two years earlier.
Jane Journeys On · Ruth Comfort Mitchell · Chapter 1