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parahydrogen

[ par-uh-hahy-druh-juhn ]
/ ˌpær əˈhaɪ drə dʒən /
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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.

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“Evoke” and “invoke” both derive from the same Latin root “vocāre.”

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Compare orthohydrogen.

Origin of parahydrogen

First recorded in 1925–30; para-1 + hydrogen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use parahydrogen in a sentence

  • If they are oriented in opposite directions, it is parahydrogen.

    Unwise Child|Gordon Randall Garrett

British Dictionary definitions for parahydrogen

parahydrogen
/ (ˌpærəˈhaɪdrədʒən) /

noun

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 directionsCompare 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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