Word:   
Definitions of lumen:
  • noun:   a cavity or passage in a tubular organ
    Example: "The lumen of the intestine"
  • 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

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Search for lumen at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

See lumen used in context: several books and articles.

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