Etymology

circumsphere

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Today it means: A sphere that is circumscribed about a polyhedron and touches each of its vertices Full definition →

English sphere ← Middle English spere ← Old French sphere
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The story

  1. Ancient Greekκίρκος (kírkos)
  2. Latincircus
  3. Latincircum
  4. Latincircum-
  5. Englishcircum-
  6. Ancient Greekσφαῖρᾰ (sphaîră)
  7. Latinsphaera
  8. Late Latinsphēra
  9. Old Frenchsphere
  10. Middle Englishspere
  11. Englishsphere
  12. English todaycircumsphere

From circum- + sphere.

Etymology from Wiktionary, CC BY-SA 4.0.