Etymology

phototherapy

P3H4O1T1O1T1H4E1R1A1P3Y4

Today it means: The use of light to treat disorders of the skin, and certain mood disorders. Full definition →

English therapy ← New Latin therapīa ← Ancient Greek θεραπεία (therapeía)
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The story

  1. Proto-Indo-European*bʰeh₂-
  2. Proto-Indo-European*bʰéh₂os
  3. Proto-Hellenic*pʰáwos
  4. Ancient Greekφᾰ́ος (phắos)
  5. Ancient Greekφῶς (phôs)
  6. Ancient Greekφωτο- (phōto-)
  7. Englishphoto-
  8. Proto-Indo-European*treb-der.?
  9. Ancient Greekθερᾰ́πων (therắpōn)
  10. Ancient Greekθεραπεύω (therapeúō)
  11. Ancient Greekθεραπεία (therapeía)
  12. New Latintherapīa
  13. Englishtherapy
  14. English todayphototherapy

From photo- + therapy.

Etymology from Wiktionary, CC BY-SA 4.0.