- 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
Examples from the Web for lumen
Historical Examples of lumen
That reminds me, I'd better arrange a debate on immigration for the Lumen.
"She made a splendid impression on the Lumen," Colburn went on.
If the lumen of the tube is as fine as a hair, a considerable rise can be observed.Natural Philosophy
Just one more word, Lumen, before we conclude this interview.
Dear Lumen, I do not half understand this new effect of the laws of light.
- 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
Word Origin for lumen
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.)).
- 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.
- 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.