Etymology

heliosphere

H4E1L1I1O1S1P3H4E1R1E1

Today it means: The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System. Full definition →

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

  1. Proto-Indo-European*sóh₂wl̥
  2. Proto-Indo-European*sh₂wél(i)yos
  3. Proto-Hellenic*hāwélios
  4. Ancient Greekἥλῐος (hḗlĭos)
  5. Englishhelio-
  6. Ancient Greekσφαῖρᾰ (sphaîră)
  7. Latinsphaera
  8. Late Latinsphēra
  9. Old Frenchsphere
  10. Middle Englishspere
  11. Englishsphere
  12. English todayheliosphere

From helio- + -sphere.

Etymology from Wiktionary, CC BY-SA 4.0.