| 单词 | foot-lambert |
| 释义 | foot-lambert /foot"lam'beuhrt/, n. 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. Abbr.: fL Also, footlambert. [1920-25] |
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