Etymograph

English

planula

Planula comes from Latin plāna ‘plane’, from plānus ‘flat’, and perhaps ultimately from Proto-Indo-European *pleh₂-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*pleh₂-1‘flat’uncertain
  2. Proto-Indo-Europeanc. 4500–2500 BCE*pl̥h₂nós1reconstructed
  3. Proto-Italicc. 1500–700 BCE*plānos1reconstructed
  4. Latinc. 75 BCE–200 CEplānus2‘flat’
  5. Latinc. 75 BCE–200 CEplāna3‘plane’
  6. Latinc. 75 BCE–200 CEplānula3diminutive of plāna
  7. Englishtodayplanula3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin planus
  2. 2 Wiktionary, Latin plana
  3. 3 Wiktionary, English planula

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*pleh₂-Wiktionary, Latin planus‘flat’uncertain
  2. Proto-Indo-Europeanc. 4500–2500 BCE*pl̥h₂nósWiktionary, Latin planusreconstructed
  3. Proto-Italicc. 1500–700 BCE*plānosWiktionary, Latin planusreconstructed
  4. Latinc. 75 BCE–200 CEplānusWiktionary, Latin plana‘flat’
  5. Latinc. 75 BCE–200 CEplānaWiktionary, English planula‘plane’
  6. Latinc. 75 BCE–200 CEplānulaWiktionary, English planuladiminutive of plāna
  7. EnglishtodayplanulaWiktionary, English planula

Linked words

through Proto-Indo-European *pleh₂- ‘flat’

field, floor, palm, planet, clan, archipelago, fluke, parma, flounder, placenta, playa, palatine, lech, polonium, pelagic, placate, veld, implacable, flay, floe, purdah, plantar, planta, 45 more

through Proto-Italic *plānos

unexplainable, explainable, 10 more

through Latin plānus ‘flat’

explain, explanation, plain, explanatory, planar, esplanade, llano, 13 more

through Latin plāna ‘plane’

plane

Today it means

noun In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula.

Sources

Sources: Wiktionary, “planula”; the older steps come from the Wiktionary entries for Latin planus, Latin plana. 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 *pleh₂- / planula

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