orthohydrogen

or·tho·hy·dro·gen
O1R1T1H4O1H4Y4D2R1O1G2E1N1
UK/ˌɔːθəˈhaɪdɹəd͡ʒ(ə)n/US/ˌoɹθəˈhaɪdɹəd͡ʒ(ə)n/

form of the hydrogen molecule (H₂) in which the two nuclei have parallel spin; about 75% of natural hydrogen

Opposite
parahydrogen
OriginEnglish hydrogen ← French hydrogène ← Ancient Greek γένος (génos) →
Scrabble 24
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Meanings

nounorthohydrogen (countable and uncountable, plural orthohydrogens)

plural orthohydrogens

  1. countableuncountablenatural sciencesform of the hydrogen molecule (H₂) in which the two nuclei have parallel spin; about 75% of natural hydrogen

Synonyms & antonyms

Origin

  1. Proto-Indo-European*h₃er-
  2. Proto-Indo-European*dʰeh₁-
  3. Proto-Indo-European*h₃érdʰeti?
  4. Proto-Indo-European*h₃erdʰ-
  5. Proto-Hellenic*ortʰwós
  6. Ancient Greekὀρθός (orthós)
  7. Englishortho-
  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. Englishorthohydrogen

From ortho- + hydrogen.

Full word history & related roots →

Rhymes & wordplay

Rhymes with orthohydrogen

hydrogendihydrogenhyperhydrogenparahydrogen
All rhymes →
Cite this entry
APA

orthohydrogen. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/orthohydrogen

MLA

“orthohydrogen.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/orthohydrogen. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “orthohydrogen,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/orthohydrogen.

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