Etymology

hypotrochoid

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Today it means: A geometric curve traced by a fixed point on the radius line outside one circle which rotates inside the perimeter of another circle. Full definition →

English trochoid ← Ancient Greek ὑπο- (hupo-) ← Proto-Indo-European *upó
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The story

  1. Proto-Indo-European*upó
  2. Ancient Greekῠ̔πό (hŭpó)
  3. Ancient Greekὑπο- (hupo-)
  4. Englishhypo-
  5. Englishtrochoid
  6. English todayhypotrochoid

From hypo- + trochoid.

Etymology from Wiktionary, CC BY-SA 4.0.