lumen

(loo′mĕn)

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(loo′mĭ-nă)
pl. lumina [L. lumen, stem lumin-, light, source of light, splendor]

1. The space within an artery, vein, intestine, or tube.
2. A unit of light, the amount of light emitted in a unit solid angle by a uniform point source of one international candle.
SEE: light unit; SEE: candela

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