Etymology

-cosa-

Today it means: Combines with the prefixes for 1–9 to form complex prefixes referring to 21–29. Full definition →

English icosa- ← Ancient Greek εἴκοσι (eíkosi) ← Proto-Hellenic *ewī́kəti
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The story

  1. Proto-Indo-European*dwóh₁
  2. Proto-Indo-European*dwi-
  3. Proto-Indo-European*déḱm̥
  4. Proto-Indo-European*(h₁)wídḱm̥ti
  5. Proto-Hellenic*ewī́kəti
  6. Ancient Greekεἴκοσι (eíkosi)
  7. Englishicosa-
  8. English today-cosa-

From icosa-, itself from words like icosagon and icosahedron, which ultimately derive from Ancient Greek εἴκοσι (eíkosi).

Words from the same roots

Ancient Greekεἴκοσι all →

docos-docosa-eicosanoic acidicosa-icositetrachorontetracos-tetracosa-

Etymology from Wiktionary, CC BY-SA 4.0.