English Explanatory Dictionary

lumen

English dictionary entry

Meanings

noun
  1. In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
  2. The cavity or channel within a tube or tubular organ.
  3. The cavity bounded by a plant cell wall.
  4. The bore of a tube such as a hollow needle or catheter.

Pronunciation

/ˈluːmən/ lo͞oʹmən /ˈlumən/ en-uk-lumen.ogg

Word forms

lumen lumens lumina

Etymology

Borrowed from Latin lūmen (“light, an opening”). Use as a unit was first adopted by French physicist André Blondel in 1894.

Related words

candela luminal lux

Derived words

decalumen endolumen kilolumen lumenal lumenally lumened lumen-hour lumenize lumenless lumen method lumenogenesis lumen second lumen-second multilumen teralumen
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