lumen

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Pronunciation

• (RP) IPA: /ˈluːmən/
• (GA) enPR: lo͞oʹmən, IPA: /ˈlumən/

Noun

lumen (plural lumens)

1. (physics) 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. (anatomy) The cavity or channel within a tube or tubular organ.
3. (botany) The cavity bounded by a plant cell wall.
4. (medicine) The bore of a tube such as a hollow needle or catheter.

Related terms

• candela
• luminal
• lux

Translations

• French: lumen
• German: Lumen
• Portuguese: lúmen
• Russian: лю́мен

Translations

• Portuguese: lúmen

Translations

• Russian: по́лость

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