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lumen
- the basic unit used to measure the flow of light in the SI system, equal to the amount of light emitted through a solid angle of one steradian by a light source with the intensity of one candela (0.0015 watt): abbrev. lm
- the bore of a hollow needle, catheter, etc.
- Anat. the passage within a tubular organ
See lumen in American Heritage Dictionary 4
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