Word Study
lumen
WORDNET DICTIONARY
Noun lumen has 2 senses
- lumen(n = noun.quantity) lm - 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; Array is a kind of luminous flux unit
- lumen(n = noun.body) Array - a cavity or passage in a tubular organ; "the lumen of the intestine" is a kind of bodily cavity, cavity, cavum
CIDE DICTIONARY
lumen, n. [L., light, an opening for light.].
- 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. [Webster 1913 Suppl.]
- An opening, space, or cavity, esp. a tubular cavity; a vacuole. [Webster 1913 Suppl.]
OXFORD DICTIONARY
lumen, n.
1 Physics the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
1 Physics the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
Usage
Abbr.: lm.
2 Anat. (pl. lumina) a cavity within a tube, cell, etc.
2 Anat. (pl. lumina) a cavity within a tube, cell, etc.
Derivative
luminal adj.
Etymology
L lumen luminis a light, an opening
THESAURUS
lumen
ASA scale, British candle, Hefner candle, Scheiner scale, bougie decimale, candle, candle lumen, candle power, candle-foot, candle-hour, candle-meter, decimal candle, exposure meter, flux, foot-candle, intensity, international candle, lamp-hour, light, light meter, light quantum, lumen meter, lumen-hour, lumeter, luminous flux, luminous intensity, luminous power, lux, photon, quantum, unit of flux, unit of light
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