Etymology

plasmasphere

P3L1A1S1M3A1S1P3H4E1R1E1

Today it means: The inner region of the magnetosphere, containing relatively cold, dense plasma, above the ionosphere Full definition →

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

  1. Proto-Hellenic*plátʰyō
  2. Proto-Hellenic*plát͏̌t͏̌ō?
  3. Ancient Greekπλάσσω (plássō)
  4. Ancient Greekπλᾰ́σμᾰ (plắsmă)
  5. Late Latinplasma
  6. Englishplasma
  7. Ancient Greekσφαῖρᾰ (sphaîră)
  8. Latinsphaera
  9. Late Latinsphēra
  10. Old Frenchsphere
  11. Middle Englishspere
  12. Englishsphere
  13. English todayplasmasphere

From plasma + -sphere.

Etymology from Wiktionary, CC BY-SA 4.0.