About The Word R

Bay Area Crosswords

Learn about the word R to help solve your crossword puzzle. Discover R definitions and meaning, origins, synonyms, related terms and more at the free Crossword Dictionary.

R

R Meaning & Definition
R Definition And Meaning

What's The Definition Of R?

[n] the length of a line segment between the center and circumference of a circle or sphere
[n] the 18th letter of the Roman alphabet
[n] (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
[n] 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 | Synonyms for R: gas constant | radius | roentgen | universal gas constant

Related Terms | Find terms related to R:

See Also | alphabetic character | constant | diam | diameter | length | letter | letter of the alphabet | radioactivity unit | radius of curvature | Roman alphabet | semidiameter

R In Webster's Dictionary

\R\ ([aum]r). R, the eighteenth letter of English alphabet, is a vocal consonant. It is sometimes called a semivowel, and a liquid. See Guide to Pronunciation, [sect][sect] 178, 179, and 250-254. ``R is the dog's letter and hurreth in the sound.'' --B. Jonson. Note: In words derived from the Greek language the letter h is generally written after r to represent the aspirated sound of the Greek "r, but does not affect the pronunciation of the English word, as rhapsody, rhetoric. The English letter derives its form from the Greek through the Latin, the Greek letter derived from the Ph[oe]nician, which, it is believed, is ultimately of Egyptian origin. Etymologically, R is most closely related to l, s, and n; as in bandore, mandole; purple, L. purpura; E. chapter, F. chapitre, L. capitulum; E. was, were; hare, G. hase; E. order, F. ordre, L. ordo, ordinis; E. coffer, coffin. {The three Rs}, a jocose expression for reading, (w)riting, and (a)rithmetic, -- the fundamentals of an education.

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