/ Dictionary / Index P parahydrogen: Meaning and Definition of Find definitions for: par•a•hy•dro•gen Pronunciation: (par"u-hī'dru-jun), [key] — n. Physics, Chem. 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. Paraguay tea Paraíba Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language