orthohydrogen noun. [ɔ:Ɵǝ(ʊ)'hʌɪdrǝdʒ(ǝ)n] E20.
[from ORTHO- + HYDROGEN.]
Physics. The form of molecular hydrogen in which the two nuclei in the molecule have parallel spins (so that the spectrum exhibits a hyperfine structure of triplets) and which forms about 75 per cent of hydrogen under normal conditions. Cf. PARAHYDROGEN.

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