lumen

Words with a similar base: lumen

'lumen'

[lumen.n.01] as in: 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

'lumen'

[lumen.n.02] as in: a cavity or passage in a tubular organ

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Examples:
the lumen of the intestine