lumen

lumen, pl. lumina lumens (lu´men, -min-a, -menz)

1. The space in the interior of a tubular structure, such as an artery or the intestine. 2. (lm) The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela. [L. light, window]
residual l. residual cleft

 

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