[ loo-muhn ]
/ ˈlu mən /
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noun, plural lu·mens, lu·mi·na [loo-muh-nuh]. /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. Abbreviation: lm
Anatomy. the canal, duct, or cavity of a tubular organ.
Botany. (of a cell) the cavity that the cell walls enclose.
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Origin of lumen
1870–75; <New Latin, special uses of Latin lūmen (stem lūmin-) light, window
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use lumen in a sentence
Sarah and Jennifer are soon trapped in the trunk of the Lumina.The Stacks: The Searing Story of How Murder Stalked a Tiny New York Town|E. Jean Carroll|April 19, 2014|DAILY BEAST
Jamie Merisotis CEO, Lumina Foundation The president asked for ideas that would be immediately implementable.How I'd Create Jobs|The Daily Beast|December 7, 2009|DAILY BEAST
Qui quociens dormit nunquam sua lumina claudit, T. Crederis esse leo vigilanti semper ocello, Ruodlieb iv.
Ad cœlum tendens ardentia lumina frustra,Lumina nam teneras arcebant vincula palmas.The Lusiad|Lus de Cames
Omnia qui magni dispexit lumina mundi, Qui stellarum ortus comperit atque obitus.
In advanced stages there is much gummy material in the lumina, and even large cavities filled with this gum may be found.Disease in Plants|H. Marshall Ward
The gray light of the waning moon, sifting through the boughs, was the true lumina for reverie.The Mascot of Sweet Briar Gulch|Henry Wallace Phillips
British Dictionary definitions for lumen
/ (ˈluːmɪn) /
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 candelaSymbol: lm
anatomy a passage, duct, or cavity in a tubular organ
a cavity within a plant cell enclosed by the cell walls
Derived forms of lumenlumenal or luminal, adjective
Word Origin for lumen
C19: New Latin, from Latin: light, aperture
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 ]
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 Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.