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foot-lambert

or foot·lam·bert

[ foot-lam-bert ]

noun

, Optics.
  1. a unit of luminance or photometric brightness, equal to the luminance of a surface emitting a luminous flux of one lumen per square foot, the luminance of a perfectly reflecting surface receiving an illumination of one foot-candle. : fL

foot-lambert

noun

  1. a former unit of luminance equal to the luminance of a surface emitting or reflecting 1 lumen per square foot. A completely reflecting surface illuminated by 1 foot-candle has a luminance of 1 foot-lambert ft-L

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Word History and Origins

Origin of foot-lambert1

First recorded in 1920–25

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foot in the door, get one'sfootle

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