Link Centre Dictionary

R

UK/ɑː/ US/ɑɹ/ common informal us

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

Synonyms
2.
3.

the 18th letter of the Roman alphabet

4.

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

Synonyms

Origin

From the Etruscan letter 𐌓 (r, “er”), from the Ancient Greek letter Ρ (R, “rho”), derived from the Phoenician letter 𐤓 (r, “reš”), from the Egyptian hieroglyph 𓁶.

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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.