lumen
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. Abbreviation: lm
Anatomy. the canal, duct, or cavity of a tubular organ.
Botany. (of a cell) the cavity that the cell walls enclose.
Origin of lumen
1Words Nearby lumen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use lumen in a sentence
That’s why it’s best to look at the lumens instead of the wattage.
The best floodlight: Light up the night and the driveway with these outdoor lighting fixtures | Irena Collaku | July 13, 2021 | Popular-ScienceBesides lumens, the biggest factor for finding the best floodlight is position.
The best floodlight: Light up the night and the driveway with these outdoor lighting fixtures | Irena Collaku | July 13, 2021 | Popular-ScienceThe number of lumens needed for an outdoor floodlight is between 700 and 2,5000.
The best floodlight: Light up the night and the driveway with these outdoor lighting fixtures | Irena Collaku | July 13, 2021 | Popular-ScienceBe sure to pay attention to the lumens or wattage of a light fixture – no dimly lit spaces here.
Tips to properly prep your home to sell for the most | Justin Noble | June 24, 2021 | Washington BladeFor huge spacesA junk-drawer flashlight’s brightness measures in the hundreds of lumens.
Treat yourself to a flashlight that’s not your phone | Rob Verger | December 15, 2020 | Popular-Science
That reminds me, I'd better arrange a debate on immigration for the lumen.
Ramsey Milholland | Booth Tarkington"She made a splendid impression on the lumen," Colburn went on.
Ramsey Milholland | Booth TarkingtonIn the second main variety of gland the secretory portion is enlarged and the lumen variously increased in size.
At about the time when a lumen appears in the Oviduct the first traces of the Wolffian duct become visible.
The Works of Francis Maitland Balfour, Volume 1 | Francis Maitland BalfourWhile undergoing this change of position it also acquires a lumen, but ends blindly both in front and behind.
The Works of Francis Maitland Balfour, Volume 1 | Francis Maitland Balfour
British Dictionary definitions for lumen
/ (ˈluːmɪn) /
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
Origin of lumen
1Derived forms of lumen
- lumenal or luminal, adjective
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
Scientific definitions for lumen
[ lōō′mən ]
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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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