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Meaning of parahydrogen

par•a•hy•dro•gen

Pronunciation: (par"u-hī'dru-jun), [key]
— n. Physics, Chem.
  1. the form of molecular hydrogen in which the nuclei of the two hydrogen atoms contained in the molecule have spins in opposite directions. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.