Etymology

circumradius

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Today it means: For a given geometric shape, the radius of the smallest circle or sphere into which it will fit. Full definition →

English radius ← Latin circum- ← Ancient Greek κίρκος (kírkos)
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The story

  1. Ancient Greekκίρκος (kírkos)
  2. Latincircus
  3. Latincircum
  4. Latincircum-
  5. Englishcircum-
  6. Englishradius
  7. English todaycircumradius

From circum- + radius.

Etymology from Wiktionary, CC BY-SA 4.0.