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[par-uh-hahy-druh-juh n] /ˌpær əˈhaɪ drə dʒən/
noun, Physics, Chemistry.
the form of molecular hydrogen in which the nuclei of the two hydrogen atoms contained in the molecule have spins in opposite directions.
Compare orthohydrogen.
Origin of parahydrogen
First recorded in 1925-30; para-1 + hydrogen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • If they are oriented in opposite directions, it is parahydrogen.

    Unwise Child Gordon Randall Garrett
British Dictionary definitions for parahydrogen


(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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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