r meaning

Pronunciation:   "r" in a sentence
Noun: r  aa(r)
  1. The 18th letter of the Roman alphabet
    - R 
  2. The length of a line segment between the centre and circumference of a circle or sphere
    - radius
Noun: R  aa(r)
  1. (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
    - gas constant, universal gas constant 
  2. A unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
    - roentgen, röntgen

Derived forms: rs, Rs

Type of: alphabetic character, constant, length, letter, letter of the alphabet, radioactivity unit

Part of: diam, diameter, Latin alphabet, Roman alphabet

Encyclopedia: R


Abbr. for “radius.”


Abbr. for “right.”


Symbol for the capacity of a pile (for example, 3R indicates three times design capacity).


Symbol for the thermal resistance of a material or component of construction.


Symbol for electrical resistance.

routine; search radius

1. Symbol for RESISTANCE. (Also, r.)
2. Radiotelegraph abbreviation for ROGER.
3. Symbol for RELUCTANCE.
4. Abbreviation of RADIUS.

    Fifth letter of a Nasdaq stock symbol specifying that the stock has rights.
    • a&r:    abbrev1. Artists a ...


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    1. critical points of r are eigenvectors of a.
    2. both the r groups are alkoxy residues.
    3. the beam bends to a circular profile of radius r.
    4. r is tetramethylene, pentamethylene, or hexamethylene.
    5. r must be partitioned for each individual component.

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