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lumen

lumen


lu·men  (lmn)
n. pl. lu·mens or lu·mi·na (-m-n)
1. Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
2. Abbr. lm Physics The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. See Table at measurement.
3. Botany The cavity bounded by a plant cell wall.
[Latin lmen, an opening, light; see leuk- in Indo-European roots.]
lumen·al, lumin·al adj.
lumen [ˈluːmɪn]
n pl -mens, -mina [-mɪnə]
1. (Mathematics & Measurements / Units) 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 candela. Symbol lm
2. (Life Sciences & Allied Applications / Anatomy) Anatomy a passage, duct, or cavity in a tubular organ
3. (Life Sciences & Allied Applications / Botany) a cavity within a plant cell enclosed by the cell walls
[New Latin, from Latin: light, aperture]
lumenal , luminal adj
lumen  (lmn)
Plural lumens or lumina
1. The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine.
2. 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.
lumen
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