WordReference Random House Unabridged Dictionary of American English © 2026
foot-lam•bert
(fŏŏt′lam′bərt),USA pronunciation n. [Optics.]
- Opticsa 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. Abbr.: fL Also, foot′lam′bert.
- 1920–25
'foot-lambert' also found in these entries (note: many are not synonyms or translations):