Dictionary

lumen

noun lu·men \ˈlü-mən\
plural lumens also lu·mi·na \-mə-nə\

Definition of LUMEN

1
:  the cavity of a tubular organ or part <the lumen of a blood vessel>
2
:  the bore of a tube (as of a hollow needle or catheter)
3
:  a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity
lu·mi·nal also lu·men·al \-mə-nəl\ adjective

Origin of LUMEN

New Latin lumin-, lumen, from Latin, light, air shaft, opening
First Known Use: 1873

Rhymes with LUMEN

lumen

noun lu·men \ˈlü-mən\   (Medical Dictionary)
plural lu·mi·na \-mə-nə\ or lumens

Medical Definition of LUMEN

1
:  the cavity of a tubular organ or part <the lumen of a blood vessel>
2
:  the bore of a tube (as of a hollow needle or catheter)
3
:  a unit of luminous flux equal to the light emitted in a steradian by a uniform point source of one candle intensity

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