lumen

[ loo-muh n ]

/ ˈlu mən /

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.

Words nearby lumen

lumbricide, lumbricoid, lumbricosis, lumbricus, lumbus, lumen, lumen-hour, lumholtz's kangaroo, luminaire, luminal, luminance

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. 2020

Examples from the Web for lumen

Some of the coccoid bodies are formed in the lumen of the gut and Malpighian tubules.
Handbook of Medical Entomology|William Albert Riley
Lumen autem mentium esse dixerunt ad discenda omnia eumdem ipsum Deum a quo facta sunt omnia.
The Catholic World, Vol. X, October 1869|Various
On the dorsal side is a ridge projecting into the lumen of the pharynx.
The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
Reflection and study had already inclined me, Lumen, to believe in the plurality of the existences of the soul.
Lumen|Camille Flammarion

The large swollen cells are granular, and very frequently there is a granular mass in the lumen of the tubule.
Alcohol: A Dangerous and Unnecessary Medicine, How and Why|Martha M. Allen

British Dictionary definitions for lumen

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 lumen

lumenal 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

Medical definitions for lumen

lumen

[ lōō′mən ]

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.

Other words from lumen

lu′men•al null adj.

Scientific definitions for lumen

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.