- 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 lumina
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
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
This is because the wall of the wood cells is very thick, and the lumina are small.Wood and Forest
Any agent which acts to produce thickening of the walls of the arterioles, narrowing their lumina, produces the same effect.Arteriosclerosis and Hypertension:
Louis Marshall Warfield
Dr. Rostafinski called the large open meshes of the net 'oka', eyes; lumina let us say!The North American Slime-Moulds
Thomas H. (Thomas Huston) MacBride
Celsius and Linnæus were complimented with the title of lumina academiæ, on account of their great learning and reputation.Lives of Eminent Zoologists, from Aristotle to Linnus
The lumina are filled with cellular detritus and are no longer bordered by a clear ring of sustentacular cytoplasm.
- 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 and History for lumina
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.