Etymology

arctanh

A1R1C3T1A1N1H4
English tanh ← Latin arcus ← Proto-Italic *arkuos
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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. Englishtanh
  7. English todayarctanh

From arc- + tanh.

Etymology from Wiktionary, CC BY-SA 4.0.