lumen

Meaning

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.

Synonyms

cavity

lm

cavern

chamber

hollow

antrum

socket

inside of a tube

coelenteron

bodily cavity

sinus

bore

Hyphenated as

lu‧men

Pronounced as (IPA)

/ˈluːmən/

Etymology

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