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foot-lambert

or foot·lam·bert

[ foo t-lam-bert ]
/ ˈfʊtˌlæm bərt /

noun Optics.

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. Abbreviation: fL

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Words nearby foot-lambert

foot-candle, foot-dragging, foot-drop, foot-in-mouth, foot-in-mouth disease, foot-lambert, foot-pound, foot-pound-second, foot-pound-second system, foot-poundal, foot-ton

Origin of foot-lambert

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for foot-lambert

foot-lambert

noun

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-lambertAbbreviation: ft-L
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012