• WordNet 3.6
    • n lumen a cavity or passage in a tubular organ "the lumen of the intestine"
    • n lumen 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
    • ***
Webster's Revised Unabridged Dictionary
    • Lumen (Photom) 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.
    • Lumen (Photom) A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness.
    • Lumen (Biol) An opening, space, or cavity, esp. a tubular cavity; a vacuole.
    • ***
Century Dictionary and Cyclopedia
    • n lumen An opening or passageway, as, in anatomy, of a hollow tubular organ: as, the lumen of the intestine or of a blood-vessel.
    • n lumen In botany, the internal cavity, or space within the wall, of a cell.
    • n lumen The unit of flux of light; the flux of light in a beam subtending unit solid angle where the source has an intensity of one hefner. See illumination, 1, and light flux.
    • n lumen The hollow tube of an operating-needle or of a hypodermic syringe.
    • ***


Webster's Revised Unabridged Dictionary
L., light, an opening for light


In literature:

Ladies and gentlemen of the Lumen Society, I await the refutation of my opponent!
"Ramsey Milholland" by Booth Tarkington
Lumen est actus perspicui.
"The Anatomy of Melancholy" by Democritus Junior
Quod ni ita fuisset, alterum illud exstitisset lumen civitatis; ad paternam enim magnitudinem animi doctrina uberior accesserat.
"Cato Maior de Senectute" by Marcus Tullius Cicero
Si sol ah czterno esset, lumen ah aeterno esset; et si pes, similiter vestigium.
"Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson" by Thomas Jefferson
A lumen is the quantity of light which falls on one square foot if the intensity of illumination is one foot-candle.
"Artificial Light" by M. Luckiesh
Haemorrhage is seldom a prominent feature, as the crushing or tearing of the vessel wall leads to the obliteration of the lumen.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
Neque enim quae postea accensa est facula, alterum lumen habebit quam illud quod ante eam fuit.
"History of Dogma, Volume 2 (of 7)" by Adolph Harnack
Lumen, equally stubborn, took his axe and went out to his work of clearing land for a new field.
"A Busy Year at the Old Squire's" by Charles Asbury Stephens
Lumen ut insolita triste tumescat aqua?
"The Life of William Ewart Gladstone, Vol. 1 (of 3)" by John Morley
Lumen ad revelationem gentium, et gloriam plebis tuae Israel.
"The St. Gregory Hymnal and Catholic Choir Book" by Various
Frequently the lumen is branched and may form a complicated anastomosing network in these cells.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Some of the coccoid bodies are formed in the lumen of the gut and Malpighian tubules.
"Handbook of Medical Entomology" by William Albert Riley
The surface then receives one lumen per square metre.
"The Nature of Animal Light" by E. Newton Harvey
In the second main variety of gland the secretory portion is enlarged and the lumen variously increased in size.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6" by Various
The inevitable result is softening of the portion farthest from the lumen of the vessel.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield
Cui literarum fama cum dedit lumen, Accepit, atque est ditior suis donis.
"The Complete Works of Richard Crashaw, Volume II (of 2)" by Richard Crashaw
ASTRA CASTRA, NUMEN LUMEN (L.), the stars my camp, God my lamp.
"Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)" by Various
The internal coat was plicated, as if too large for the lumen.
"A System of Practical Medicine by American Authors, Vol. I" by Various
Tu, qui, instar Phoebi, lumen orbi, et orbes luminibus reddis, iterum salve!
"A Book about Doctors" by John Cordy Jeaffreson
Thus is formed the lumen of the Oviduct.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour

In news:

Lumen Dynamics Eric Caron discusses UV curing systems.
Lumen (Rush) Rushing, 67, of Altha, FL, passed away Saturday night, December 18, 2010, at his home.
Sadly, Lumen 's green efforts have gone relatively unnoticed.
A lack of demand for sustainable spirits has shaped Lumen 's liquor choices.
Lansing Catholic wasn't satisfied with winning the CAAC-Division 3 championship, the Cougars added a Class B district title Friday night when they beat Jackson Lumen Christi by 12.
For example, if a light uses 10 LEDs that have a maximum output rating of 100 lumens , the raw lumen output would be 1,000 lumens (10 x 100 = 1,000).
Lumene Vitamin C + Collection.
The 6.4-pound projector provides a 2,500:1 contrast ratio and 2,000 ANSI lumens of brightness.
The LX400 from Christie Digital is a 4,000-lumen projector with a native XGA resolution and 1000 :1 contrast ratio.
The Caleb Lumen Pungowiyi scholarship program extends its deadline to August 10th (hear more in Monday's.
The EIKI LC-X71 XGA Boardroom Series portable data/video projector features 5,500 ANSI lumens of brightness and a 1,000:1 contrast ratio.
Enhancing its 3000 lumen professional projector lineup, Sharp Electronics introduces the XG-F315X DLP Brilliant Color projector.
Incredibly compact for its lumen performance, the TITAN 800 platform incorporates DPI's advanced image Warp and Blend capabilities , available 3D capability and a host of professional features to suit almost any commercial.
SIM2's latest Grand Cinema C3X series projector delivers 3,000 lumens brightness and contrast up to 35,000:1.
When The Franklin Institute in Philadelphia needed an AV integrator to turn an out-of-date theater into a state-of-the-art 3D cineplex, it called on Birmingham, Ala.-based Media-Merge and bought a pair of 15,000-lumen DLP projectors.

In science:

The urethra position (lumen centre) is recorded in the TRUS and MRI components for every bi-modality image (see figure 3).
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
The verification on urethra (lumen centre) is reported in table IV for 4 out of these 11 patients.
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
Cholanic acid derivatives can interrupt integrity of blood vessel walls, increase their permeability and dilate lumens of vessels of derma papillary layer (i.e. to influence rate of entering tissues by phagocytes). (See Appendix 7.
Model of pathogenesis of psoriasis. Part 1. Systemic psoriatic process
Technical issues Key technical issues of concern to municipalities is how LED signals perform in actual installations. A number of technical challenges facing LED signals have been completely or partially overcome: these range from flicker to controller compatibility to lumen maintenance.
Increasing Market Penetration of LED Traffic Signals in New York State: Review of Articles and Information on LED Traffic Signals
Fig. 1. Methods used to study near-surface effects. (A) Gel sample, surrounded by microspherecontaining solution, is sandwiched between two thin glass cover slides, sealed with Parafilm. (B) Gel sample contains a solution-filled cylindrical lumen.
Long-range forces extending from polymer-gel surfaces
Yet another test of the polymer-diffusion hypothesis was to continuously infuse microsphere suspensions into the cylindrical lumen under pressure (configuration B).
Long-range forces extending from polymer-gel surfaces