| 单词 | foot-lambert |
| 释义 | foot-lambert in British Englishnoun 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 Abbreviation: ft-Lfoot-lambert in American English (ˈfutˌlæmbərt) 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. Also: footlambert Word origin [1920–25]This word is first recorded in the period 1920–25. Other words that entered Englishat around the same time include: Unknown Soldier, follow-up, fundamentalism, superpower, tie-in |
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