English Wikipedia has an article on:

lumen

Wikipedia

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

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

• Audio (UK):

  (file)

• Rhymes: -uːmən
• Hyphenation: lu‧men

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.

• candela
• luminal
• lux

• IPA^(key): [ˈlumɛn]
• Hyphenation: lu‧men

Borrowed from Latin lumen.

lumen m inan

1. lumen (unit of luminous flux)

lumen m anim

1. capable talented person

• “lumen”, in Příruční slovník jazyka českého (in Czech), 1935–1957
• “lumen”, in Slovník spisovného jazyka českého (in Czech), 1960–1971, 1989

Borrowed from Latin lumen.

• IPA^(key): /ˈlu(ː)men/, [ˈlu(ː)me̞n]
• Rhymes: -umen
• Syllabification^(key): lu‧men
• Hyphenation^(key): lu‧men

lumen

1. (physics, anatomy, botany, medicine) lumen

• luumen

• “lumen”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎^[1] (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-01

• IPA^(key): /ˈlumen/, [ˈlume̞n]
• Rhymes: -umen
• Syllabification^(key): lu‧men
• Hyphenation^(key): lu‧men

lumen

1. genitive singular of lumi

• lemun, melun

Borrowed from Latin lumen.

• IPA^(key): /ly.mɛn/

• Audio (Paris):

  (file)

lumen m (plural lumens)

1. (physics) lumen (SI unit of measurement)
2. (anatomy) lumen
3. (botany) lumen

• “lumen”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

From Proto-Italic *louksmən, from Proto-Indo-European *léwk-s-mn̥, derived from the root *lewk- (“bright”).^[1] By surface analysis, lū(x) +‎ -men.

• (Classical Latin) IPA^(key): /ˈluː.men/, [ˈɫ̪uːmɛn]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈlu.men/, [ˈluːmen]

lūmen n (genitive lūminis); third declension

1. light, source of light

   Synonym: lūx

2. (poetic) the eyes
   • 29 BCE – 19 BCE, Virgil, Aeneid 4.185:

     [...] nec dulcī dēclīnat lūmina somnō.

     [Rumor] never closes her eyes in sweet slumber.

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
8. (figuratively) a luminary, star, light (a most distinguished person)

Third-declension noun (neuter, imparisyllabic non-i-stem).

• “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 with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• lumen in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[2], 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
    

Polish Wikipedia has an article on:

lumen

Wikipedia ^pl

Learned borrowing from Latin lūmen.

• IPA^(key): /ˈlu.mɛn/

• Audio:

  (file)

• Rhymes: -umɛn
• Syllabification: lu‧men

lumen m inan (abbreviation lm)

1. (physics) lumen (derived SI unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela)

• lumen in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• lumen in Polish dictionaries at PWN
• lumen in PWN's encyclopedia

Borrowed from Latin lumen, French lumen. Doublet of the inherited lume.

lumen m (plural lumeni)

1. (physics) lumen (SI unit of measurement)

lumen n (plural lumene)

1. (anatomy) lumen

Borrowed from Latin lumen. Doublet of the inherited lumbre.

• IPA^(key): /ˈlumen/ [ˈlu.mẽn]
• Rhymes: -umen
• Syllabification: lu‧men

lumen m (plural lúmenes)

1. lumen

• “lumen”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10

Borrowed from Latin lumen.

lumen

1. lumen (singular and plural)

• mulen, mulne