'Lumen' definitions:
Definition of 'lumen'
(from WordNet)
noun
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 [syn: lumen, lm]
noun
A cavity or passage in a tubular organ; "the lumen of the intestine"
Definition of 'Lumen'
From: GCIDE
- Lumen \Lu"men\, n.; pl. L. Lumina, E. Lumens. [L., light, an opening for light.]
- 1. (Photom.) (a) 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. (b) A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness. [Webster 1913 Suppl.]
- 2. (Biol.) An opening, space, or cavity, esp. a tubular cavity; a vacuole. [Webster 1913 Suppl.]
Synonyms of 'lumen'
From: Moby Thesaurus
- ASA scale,
- bougie decimale,
- British candle,
- candle,
- candle lumen,
- candle power,
- candle-foot,
- candle-hour,
- candle-meter,
- decimal candle,
- exposure meter,
- flux,
- foot-candle,
- Hefner 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,
- Scheiner scale,
- unit of flux,
- unit of light