Etymology

arccosine

A1R1C3C3O1S1I1N1E1

Today it means: Any of several single-valued or multivalued functions that are inverses of the cosine function. Full definition →

English cosine ← Latin sinus ← Arabic جِيبَ (jība)
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The story

  1. Proto-Indo-European*h₂erkʷ-
  2. Proto-Indo-European*h₂erkʷos
  3. Proto-Italic*arkuos
  4. Latinarcus
  5. Englisharc-
  6. Englishco-
  7. Proto-Indo-European*sinos
  8. Proto-Italic*sinus
  9. Arabicجِيبَ (jība)
  10. Latinsinus
  11. Englishsine
  12. Englishcosine
  13. English todayarccosine

From arc- + cosine.

Etymology from Wiktionary, CC BY-SA 4.0.