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- The unit of luminous flux. The lumen is equal to the luminous flux emitted by a 1-candle light source at a 1 ft distance. The foot-candle represents one lumen per square foot.
- space within an organ or tube
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- The channel within a tubular organ; for example, the lumen of the intestine.
Source: Biotechnology Glossary