lumen

Etymology

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

Pronunciation

• (Received Pronunciation) IPA^(key): /ˈluːmən/
• (General American) enPR: lo͞oʹmən, IPA^(key): /ˈlumən/

• Audio (UK)

  (file)

• Rhymes: -uːmən
• Hyphenation: lu‧men

Noun

lumen (plural lumens or lumina)

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.

Noun

lumen m

1. lumen (unit of luminous flux)

Further reading

• lumen in Příruční slovník jazyka českého, 1935–1957
• lumen in Slovník spisovného jazyka českého, 1960–1971, 1989

Etymology 1

Etymology 2

Anagrams

• lemun, melun

Etymology

From Proto-Indo-European *léwksmn̥, derived from the root *lewk- (“bright”).^[1]
Equivalent to lūx +‎ -men. False cognate to Finnish lumen (“snow's”) (from Proto-Finnic *lumi (“snow”), from Proto-Uralic *lome, see e.g. Finnish lumenvalkoinen (“snow white”)).

Pronunciation

• (Classical) IPA^(key): /ˈluː.men/, [ˈɫuː.mẽ]
• (Ecclesiastical) IPA^(key): /ˈlu.men/, [ˈluː.men]

Noun

lūmen n (genitive lūminis); third declension

1. light
2. (poetic) the eyes
3. (poetic) daylight
4. (poetic) brightness
5. (poetic) the light of life
6. An opening through which light can penetrate such as an air-hole or a window.
7. The opening or orifice in a water-pipe or funnel

References

• lumen in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• lumen in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• lumen in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• lumen in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
• Carl Meissner; Henry William Auden (1894) Latin Phrase-Book‎, London: Macmillan and Co.
  • to lose one's sight: oculos, lumina amittere
    
  • to deprive a person of his eyes: luminibus orbare aliquem
    
  • to obscure the mental vision: mentis quasi luminibus officere (vid. sect. XIII. 6) or animo caliginem offundere
    
  • shining lights in the literary world: clarissima litterarum lumina
    
  • flowers of rhetoric; embellishments of style: lumina, flores dicendi (De Or. 3. 25. 96)
    
  • to obstruct a person's view, shut out his light by building: luminibus alicuius obstruere, officere
    

Noun

lumen m inan

1. lumen (SI-unit)

Noun

lumen m (plural lúmenes)

1. lumen

Noun

lumen

1. lumen (singular and plural)