Etymology

costar

C3O1S1T1A1R1

Today it means: A person who shares star billing with another. Full definition →

English star ← Middle English sterre ← Old English steorra
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The story

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincon-
  6. Latinco-
  7. Englishco-
  8. Proto-Indo-European*h₂eHs-
  9. Proto-Indo-European*h₂stḗr
  10. Proto-Germanic*sternǭ
  11. Proto-West Germanic*sternō
  12. Proto-West Germanic*sterrō
  13. Old Englishsteorra
  14. Middle Englishsterre
  15. Englishstar
  16. English todaycostar

From co- + star.

Etymology from Wiktionary, CC BY-SA 4.0.