Test Your Vocabulary

Take Our 10-Question Quiz

Name That Thing

Take our visual vocab quiz

Test Your Knowledge »

True or False?

A quick quiz about stuff worth knowing

Take It Now »

Join Us on FB & Twitter

Get the Word of the Day and More

Facebook | Twitter

lumen

2 ENTRIES FOUND:

lu·men

noun \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

Browse

Next Word in the Dictionary: lumen–hour
Previous Word in the Dictionary: lume
All Words Near: lumen

Seen & Heard

What made you want to look up lumen? Please tell us where you read or heard it (including the quote, if possible).