EXAMPLES | WORD ORIGIN noun, plural lu·mens, lu·mi·na . [ loo-m uh-n uh] /ˈlu mə nə/ . Optics the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity. : lm Abbreviation . Anatomy the canal, duct, or cavity of a tubular organ. . Botany (of a cell) the cavity that the cell walls enclose. Origin of lumen 1870–75; < New Latin, special uses of Latin lūmen (stem lūmin-) light, window
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for lumen Historical Examples of lumen
That reminds me, I'd better arrange a debate on immigration for the
"She made a splendid impression on the
Lumen," Colburn went on.
lumen of the tube is as fine as a hair, a considerable rise can be observed.
Just one more word,
Lumen, before we conclude this interview.
Lumen, I do not half understand this new effect of the laws of light. British Dictionary definitions for lumen noun plural -mens or -mina ( -mɪnə) the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela Symbol: lm anatomy a passage, duct, or cavity in a tubular organ a cavity within a plant cell enclosed by the cell walls Derived Forms lumenal or luminal, adjective Word Origin for lumen
C19: New Latin, from Latin: light, aperture
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for lumen n.
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.)).
Online Etymology Dictionary, © 2010 Douglas Harper
n. pl. lumens The inner open space or cavity of a tubular organ, as of a blood vessel. The unit of luminous flux in the International System of Units, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. Related forms lu null ′men•al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Plural lumens lumina The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine. The SI derived unit used to measure the amount of light passing through a given area per second. One lumen is equal to the luminous flux passing per unit solid angle from a light source with a strength of one candela.
The American Heritage® Science Dictionary
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