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The Collaborative International Dictionary

Lumen \Lu"men\, n.; pl. L. Lumina, E. Lumens. [L., light, an opening for light.]

  1. (Photom.)

    1. A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere.

    2. A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness.

  2. (Biol.) An opening, space, or cavity, esp. a tubular cavity; a vacuole.

Douglas Harper's Etymology Dictionary

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.)).


n. 1 (context physics English) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm. 2 (context anatomy English) The cavity or channel within a tube or tubular organ. 3 (context botany English) The cavity bounded by a plant cell wall. 4 (context medicine English) The bore of a tube such as a hollow needle or catheter.

  1. n. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions [syn: lm]

  2. a cavity or passage in a tubular organ; "the lumen of the intestine"

  3. [also: lumina (pl)]


Lumen can refer to:

  • Lumen (unit), the SI unit of luminous flux
  • Lumen (anatomy), the cavity or channel within a tubular structure
  • Thylakoid lumen, the inner membrane space of the chloroplast
  • Phenobarbital (trade name)
  • Lumen (website), a database of Digital Millennium Copyright Act takedown requests
  • Lumen (branding agency), a design and branding company headquartered in Milan, Italy
  • Lumens (company), a Sacramento lighting company
  • 141 Lumen, an asteroid
  • Lumen (band), a Russian rock band
  • Lumen Martin Winter (1908–1982), American artist
  • Lumen Pierce, a fictional character in the television series Dexter
  • USS Lumen (AKA-30), a US Navy ship
Lumen (website)

Lumen, formerly Chilling Effects, is a collaborative archive created by Wendy Seltzer and founded along with several law school clinics and the Electronic Frontier Foundation to protect lawful online activity from legal threats. Its website, Chilling Effects Clearinghouse, allows recipients of cease-and-desist notices to submit them to the site and receive information about their legal rights and responsibilities.

Lumen (unit)

The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source. Luminous flux differs from power ( radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model of the human eye's sensitivity to various wavelengths. Lumens are related to lux in that one lux is one lumen per square meter.

The lumen is defined in relation to the candela as

1 lm = 1 cdsr.

A full sphere has a solid angle of 4π steradians, so a light source that uniformly radiates one candela in all directions has a total luminous flux of .

Lumen (anatomy)

In biology, a lumen (; plural lumina) is the inside space of a tubular structure, such as an artery or intestine. By extension, the term lumen is also used to describe the inside space of a cellular component or structure, such as the endoplasmic reticulum.

Lumen (band)

Lumen is a Russian rock band from Ufa. It has released 7 studio albums to date.

The band considers February 12, 1998 as its birthday because on that date it had performed as "Lumen" for the first time. The band's earlier works have an alternative rock sound with a strong influence of punk. However, they took a heavier approach on later releases. The lyrics are usually written by singer and frontman Rustem "Tem" Bulatov. The band's songs are inspired by diverse controversial events and issues which take place inside and outside Russia, as well as personal struggles.

Lumen (branding agency)

Lumen is a Milan-based multi-disciplined creative and design consulting agency, founded by Pietro Rovatti and Drew Smith in 2003.

Usage examples of "lumen".

Thomas said, wryly, as he let himself relax into the pool, savoring its comforts before steeling himself to get out, dress himself, feed himself, and take a trip to the center of what Lumen called the galaxy--implying thereby that the Milky Way was merely one sidereal system among many.

In fact, Lumen seems to me to be as dedicated a celebrant of complex inter-relationships between creatures of many different kinds as his adversary Aristocles.

He took the liberty of pressing Lumen on the issue when his comrades eventually fell uneasily silent as they gathered at the foot of the mighty cannon-cum-telescope that would transmit them to the heart of the sidereal system.

If Lumen were not sincere, and was not the friend to humankind as which it posed.

The fleshcore had to know about his ethereal passenger, but Lumen had seemed to think that the machines might not.

Nor did it seem to him, any longer, at all possible that he had actually said what he had said to the Great Fleshcore, or that he had been party to what the ethereal Lumen had said, by means of his dancing fingertips, to the luckless Aristocles .

Thomas said, wryly, as he let himself relax into the pool, savoring its comforts before steeling himself to get out, dress himself, feed himself, and take a trip to the center of what Lumen called the galaxyimplying thereby that the Milky Way was merely one sidereal system among many.

He had, of course, no way to think all this save for subvocalization, but Lumen prudently refrained from comment on the suspicion that he might be in accord with Aristocles on at least some matters concerning the nature of humankind.

After removing the trocar from the lumen of the imbedded implantation needle, he attached the syringe.

Our smooth-muscle cells are born with complete instructions, in need of no help from us, and they work away on their own schedules, modulating the lumen of blood vessels, moving things through intestines, opening and closing tubules according to the requirements of the entire system.

In infants up to six months botulinum can replicate because of the relative sterility of the intestinal lumen and the low acidity.

Low acidity or relatively sterile intestinal lumen as a result of pretreatment with broad-spectrum antibiotics are often factors.

In the pale blue light of lumen reeds, the faces of the chanters appeared ravaged, their bodies misshapen.

In an instant, several million slender, rod-shaped microorganisms filled the lumen of the fallopian tubes.

Zelzony into a light airy room where mirrors danced lumen lines into sculptures that changed position as the angle of the sun changed and gradually acquired a flush as it sank toward the horizon.