para-hydrogen
noun
¦parə+
: molecular hydrogen in which the two hydrogen nuclei are spinning in opposite directions so that their contribution to the total angular momentum is zero compare ortho-hydrogen
Word History
Etymology
para- entry 1 + hydrogen
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- rat-a-tat-tat
- rat-arsed
- rat-bite fever
- rat-claw foot
- rat-poison plant
- rat-stripper
- rat-tail file
- rat-tailed
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- rat-tat
- rat-tat-tat
- rata
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- ratably