First Known Use: 1873
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
See lumen defined for kids
ADVERTISEMENT
Origin of LUMEN
New Latin lumin-, lumen, from Latin, light, air shaft, opening
Medical Dictionary
lumen
noun lu·men \ˈlü-mən\
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
Learn More About LUMEN
Browse
Next Word in the Dictionary: lumen–hourPrevious Word in the Dictionary: lumefantrineAll Words Near: lumen
ADVERTISEMENT
Seen & Heard
What made you want to look up lumen? Please tell us where you read or heard it (including the quote, if possible).