WordReference Random House Unabridged Dictionary of American English © 2019
foot-can•dle  (fŏŏtkandl),USA pronunciation n. [Optics.]
  1. Opticsa unit of illuminance or illumination, equivalent to the illumination produced by a source of one candle at a distance of one foot and equal to one lumen incident per square foot. Abbr.: FC
 Also,  footcandle. 
  • 1905–10

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