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English Dictionary: r by the DICT Development Group
2 results for r
From WordNet (r) 3.0 (2006) [wn]:
  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
    Synonym(s): roentgen, R
  2. (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
  3. the 18th letter of the Roman alphabet
    Synonym(s): R, r
  4. the length of a line segment between the center and circumference of a circle or sphere
    Synonym(s): radius, r
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   R \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. [bd]R is the dog's letter and hurreth in the
      sound.[b8] --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.
No guarantee of accuracy or completeness!
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