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[awr-thuh-hahy-druh-juh n] /ˌɔr θəˈhaɪ drə dʒən/

noun, Physics, Chemistry.
the form of molecular in which the nuclei of the two atoms contained in the molecule have spins in the same direction.
(chem) the form of molecular hydrogen, constituting about 75 per cent of the total at normal temperatures, in which the nuclei of the atoms spin in the same direction Compare parahydrogen


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