lumen
[ loo-muh n ]
/ ˈlu mən /
noun, plural lu·mens, lu·mi·na [loo-muh-nuh] /ˈlu mə nə/.
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
1870–75; < New Latin, special uses of Latin
lūmen (stem
lūmin-) light, window
Words nearby lumen
lumbricide,
lumbricoid,
lumbricosis,
lumbricus,
lumbus,
lumen,
lumen-hour,
lumholtz's kangaroo,
luminaire,
luminal,
luminance
Example sentences from the Web for lumen
British Dictionary definitions for lumen
lumen
/ (ˈluːmɪn) /
noun plural -mens or -mina (-mɪnə)
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
anatomy
a passage, duct, or cavity in a tubular organ
a cavity within a plant cell enclosed by the cell walls
Derived forms of lumen
lumenal or luminal, adjectiveWord Origin for lumen
C19: New Latin, from Latin: light, aperture
Medical definitions for lumen
lumen
[ lōō′mən ]
n. pl. lumens
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.
Other words from lumen
lu′men•al null adj.Scientific definitions for lumen
lumen
[ lōō′mən ]
Plural lumens lumina
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.