Etymograph

English

placenta

Placenta comes from New Latin placenta, from Ancient Greek πλακοῦς ‘flat cake’, and ultimately from Proto-Hellenic *pləks.

  1. Proto-Hellenicc. 2200–1600 BCE*pləks1reconstructed
  2. Ancient Greekc. 800–300 BCEπλάξ2pláx‘flat’
  3. Ancient Greekc. 800–300 BCEπλακοῦς2plakoûs‘flat cake’
  4. Ancient Greekc. 800–300 BCEπλακόεντα2
  5. New Latinc. 1500–1900placenta3literally ‘flat cake’
  6. Englishtodayplacenta3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Ancient Greek πλάξ
  2. 2 Wiktionary, Latin placenta
  3. 3 Wiktionary, English placenta

Earlier history uncertain. See Wiktionary.

Lineage

  1. Proto-Hellenicc. 2200–1600 BCE*pləksWiktionary, Ancient Greek πλάξreconstructed
  2. Ancient Greekc. 800–300 BCEπλάξWiktionary, Latin placentapláx‘flat’
  3. Ancient Greekc. 800–300 BCEπλακοῦςWiktionary, Latin placentaplakoûs‘flat cake’
  4. Ancient Greekc. 800–300 BCEπλακόενταWiktionary, Latin placenta
  5. New Latinc. 1500–1900placentaWiktionary, English placentaliterally ‘flat cake’
  6. EnglishtodayplacentaWiktionary, English placenta

The story

Learned borrowing from New Latin placenta (literally “flat cake”), an ellipsis of phrases such as placenta uterī (literally “womb cake”) and placenta uterīna (literally “uterine cake”), because of the flat round shape of the afterbirth.

Full etymology on Wiktionary

Linked words

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

field, floor, explain, plane, palm, explanation, plain, clan, archipelago, fluke, explanatory, parma, flounder, playa, planar, palatine, lech, polonium, esplanade, pelagic, veld, placate, implacable, floe, purdah, llano, plantar, planta, 49 more

through Ancient Greek πλάξ ‘flat’

flay, 8 more

Today it means

noun An organ in most mammals during gestation that supplies food and oxygen to the foetus and passes back waste. It is on the wall of the uterus and links to the foetus through the umbilical cord. It is expelled after birth.

Sources

Sources: Wiktionary, “placenta”; the older steps come from the Wiktionary entries for Ancient Greek πλάξ, Latin placenta. 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-Hellenic *pləks / placenta

Shirt and support for this word