Etymology

phototoxicity

P3H4O1T1O1T1O1X8I1C3I1T1Y4

Today it means: Any adverse effect due to exposure to light, especially such effects on the skin Full definition →

English toxicity ← French toxique ← Latin toxicu
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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. Ancient Greekτοξῐκός (toxĭkós)
  9. Ancient Greekτοξικόν (toxikón)
  10. Latintoxicum
  11. Latintoxicu
  12. Frenchtoxique
  13. Englishtoxic
  14. Englishtoxicity
  15. English todayphototoxicity

From photo- + toxicity.

Etymology from Wiktionary, CC BY-SA 4.0.