Etymology

cosecant

C3O1S1E1C3A1N1T1

Today it means: In a right triangle, the reciprocal of the sine of an angle. Symbols: cosec, csc Full definition →

English secant ← Latin secāns ← Proto-Italic *sekaō
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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*sek-
  9. Proto-Indo-European*sékh₁yeti
  10. Proto-Italic*sekaō
  11. Latinsecō
  12. Latinsecāns
  13. Englishsecant
  14. English todaycosecant

From co- + secant.

Etymology from Wiktionary, CC BY-SA 4.0.