1 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: lm]
2 a cavity or passage in a tubular organ; "the lumen of the intestine" [also: lumina (pl)]
- In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm.
- The cavity or channel within a tube or tubular organ.
- The cavity bounded by a plant cell wall.
- The bore of a tube such as a hollow needle or catheter.
Etymology 2inflected form of lumi
- lumen (singular and plural)
Lumen can mean:
lumen in German: Lumen
lumen in Spanish: Lumen
lumen in French: Lumen
lumen in Indonesian: Lumen
lumen in Japanese: ルーメン (曖昧さ回避)
lumen in Dutch: Lumen
lumen in Polish: Lumen
lumen in Slovak: Lúmen
lumen in Slovenian: Lumen (razločitev)
lumen in Finnish: Luumen
lumen in Swedish: 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