parahydrogen

[ 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.

Nearby words

  1. paraguay tea,
  2. paraguayan,
  3. parahemophilia,
  4. parahippocampal gyrus,
  5. parahormone,
  6. parainfluenza,
  7. parainfluenza 1 virus,
  8. parainfluenza 2 virus,
  9. parainfluenza 3 virus,
  10. parainfluenza 4 virus

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. 2019

Examples from the Web for parahydrogen

  • 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