photohydrogen

P3H4O1T1O1H4Y4D2R1O1G2E1N1

noun

hydrogen produced (along with oxygen) by the photolytic decomposition of water in certain anaerobic algae etc

OriginEnglish hydrogen ← French hydrogène ← Ancient Greek γένος (génos) →
Scrabble 26
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Meanings

nounphotohydrogen (uncountable)
  1. uncountablebiochemistryhydrogen produced (along with oxygen) by the photolytic decomposition of water in certain anaerobic algae etc

Origin

  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*wed-
  9. Proto-Indo-European*wódr̥
  10. Proto-Hellenic*údōr
  11. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
  12. Ancient Greekὑδρο- (hudro-)
  13. Frenchhydro-
  14. Proto-Indo-European*ǵenh₁-
  15. Proto-Indo-European*ǵénh₁os
  16. Proto-Hellenic*génos
  17. Ancient Greekγένος (génos)
  18. Frenchhydrogène
  19. Englishhydrogen
  20. Englishphotohydrogen

From photo- + hydrogen.

Full word history & related roots →
Cite this entry
APA

photohydrogen. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/photohydrogen

MLA

“photohydrogen.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/photohydrogen. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “photohydrogen,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/photohydrogen.

Source: photohydrogen on Wiktionary, CC BY-SA 4.0.