| 单词 | foot-lambert |
| 释义 | foot-lambertor foot·lam·bert[ foot-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 Origin of foot-lambertFirst recorded in 1920–25 Words nearby foot-lambertfooting piece, foot-in-mouth, foot-in-mouth disease, foot in one's mouth, put one's, foot in the door, get one's, foot-lambert, footle, footless, footlet, foot level, footlight Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for foot-lambertfoot-lambert nouna 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 |
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