Etymology

petrosphere

P3E1T1R1O1S1P3H4E1R1E1

Today it means: Any roughly spherical artefact made of stone. Full definition →

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

  1. Latinpetra
  2. Englishpetro-
  3. Ancient Greekσφαῖρᾰ (sphaîră)
  4. Latinsphaera
  5. Late Latinsphēra
  6. Old Frenchsphere
  7. Middle Englishspere
  8. Englishsphere
  9. English todaypetrosphere

From petro- + -sphere.

Etymology from Wiktionary, CC BY-SA 4.0.