Etymology

pyrheliometry

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Today it means: The study (and measurement) of solar radiation using a pyrheliometer. Full definition →

English helio- ← Ancient Greek ἥλῐος (hḗlĭos) ← Proto-Hellenic *hāwélios
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The story

  1. Proto-Indo-European*péh₂wr̥
  2. Proto-Hellenic*pāwər
  3. Ancient Greekπῦρ (pûr)
  4. Latinpyr
  5. Englishpyro-
  6. Englishpyr-
  7. Proto-Indo-European*sóh₂wl̥
  8. Proto-Indo-European*sh₂wél(i)yos
  9. Proto-Hellenic*hāwélios
  10. Ancient Greekἥλῐος (hḗlĭos)
  11. Englishhelio-
  12. English todaypyrheliometry

From pyr- + helio- + -metry.

Etymology from Wiktionary, CC BY-SA 4.0.