Etymology

magnetosphere

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Today it means: The comet-shaped region around Earth or another planet in which charged particles are trapped or deflected. Shaped by the solar wind and the planet's magnetic field. Full definition →

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

  1. Ancient GreekΜάγνης (Mágnēs)
  2. Ancient Greekμᾰ́γνης (mắgnēs)
  3. Old Frenchmagnete
  4. Ancient Greekμᾰ́γνης (mắgnēs)
  5. Latinmagnēs
  6. Middle Englishmagnete
  7. Englishmagnet
  8. Englishmagnet-
  9. Englishmagneto-
  10. Ancient Greekσφαῖρᾰ (sphaîră)
  11. Latinsphaera
  12. Late Latinsphēra
  13. Old Frenchsphere
  14. Middle Englishspere
  15. Englishsphere
  16. English todaymagnetosphere

From magneto- + -sphere.

Etymology from Wiktionary, CC BY-SA 4.0.