[par-uh-hahy-druh-juh n] /ˌpær əˈhaɪ drə dʒən/

noun, Physics, Chemistry.
the form of molecular in which the nuclei of the two atoms contained in the molecule have spins in opposite directions.
(chem) the form of molecular hydrogen (constituting about 25 per cent of the total at normal temperatures) in which the nuclei of the two atoms in each molecule spin in opposite directions Compare orthohydrogen


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