Candela

n. (Optics) unit for measuring the intensity of light

The candela (symbol: cd) is the SI base unit of luminous intensity (that is, power emitted by a light source in a particular direction, with wavelengths weighted by the luminosity function, a standardized model of the sensitivity of the human eye).
See more at Wikipedia.org...

Noun
1. the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin
(synonym) candle, cd, standard candle
(hypernym) luminous intensity unit, candlepower unit

n. candela, unit for measuring the intensity of light (Optics)

n. candle, candlepower, plug