Etymograph

English

luminometer

Luminometer comes from Latin lūminō ‘to illuminate’, from lūmen ‘light, source of light’, and ultimately from Proto-Indo-European *lewk- ‘bright’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*lewk-1‘bright’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*léwksmn̥1reconstructed
  3. Proto-Italicc. 1500–700 BCE*louksmən1reconstructed
  4. Latinc. 75 BCE–200 CElūmen1‘light, source of light’
  5. Latinc. 75 BCE–200 CElūminō2‘to illuminate’
  6. Englishtodayluminometer2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin lumino
  2. 2 Wiktionary, English luminometer

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*lewk-Wiktionary, Latin lumino‘bright’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*léwksmn̥Wiktionary, Latin luminoreconstructed
  3. Proto-Italicc. 1500–700 BCE*louksmənWiktionary, Latin luminoreconstructed
  4. Latinc. 75 BCE–200 CElūmenWiktionary, Latin lumino‘light, source of light’
  5. Latinc. 75 BCE–200 CElūminōWiktionary, English luminometer‘to illuminate’
  6. EnglishtodayluminometerWiktionary, English luminometer

Linked words

through Proto-Indo-European *lewk- ‘bright’

light, low, link, los, lucy, ounce, lunar, lea, luna, lux, lucid, translucent, lynx, luce, loach, lune, leucine, lum, 76 more

through Latin lūmen ‘light, source of light’

lumen, lumia, luminosity, luminescent, 20 more

through Latin lūminō ‘to illuminate’

illumination, illuminate, 6 more

Today it means

noun photometer

Sources

Sources: Wiktionary, “luminometer”; the older steps come from the Wiktionary entry for Latin lumino. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *lewk- / luminometer

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