Etymograph

English

fluctus

Fluctus comes from Latin fluctus ‘a wave, billow’, from fluō ‘to flow, stream, pour’, and ultimately from Proto-Indo-European *bʰlewH- ‘to overflow’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰlewH-1‘to overflow’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*bʰluH-yé-ti1uncertain
  3. Latinc. 75 BCE–200 CEfluō1‘to flow, stream, pour’
  4. Latinc. 75 BCE–200 CEfluctus1‘a wave, billow’
  5. Englishtodayfluctus1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English fluctus

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰlewH-Wiktionary, English fluctus‘to overflow’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*bʰluH-yé-tiWiktionary, English fluctusuncertain
  3. Latinc. 75 BCE–200 CEfluōWiktionary, English fluctus‘to flow, stream, pour’
  4. Latinc. 75 BCE–200 CEfluctusWiktionary, English fluctus‘a wave, billow’
  5. EnglishtodayfluctusWiktionary, English fluctus

Linked words

through Proto-Indo-European *bʰluH-yé-ti

fluidity, confluent, 25 more

through Latin fluō ‘to flow, stream, pour’

influence, fluid, influx, fluent, flux, confluence, fluency, affluence, fluorine, flume, fluvial, fluorite, fluor, 27 more

Today it means

noun An area covered by outflow from a volcano.

Sources

Sources: Wiktionary, “fluctus”. 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 *bʰlewH- / fluctus

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