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lumen (n.)
[lumen 词源字典]
unit of luminosity, 1897, coined 1894 by French physicist André-Eugène Blondel (1863-1938) from Latin
lumen
"light," related to
lucere
"to shine" (see
light
(n.)).
[lumen etymology, lumen origin, 英语词源]
[lumen 词源字典]