para-hydrogen

par·a·hy·dro·gen

[par-uh-hahy-druh-juhn]
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:
1925–30; para-1 + hydrogen

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parahydrogen (ˌpærəˈhaɪdrədʒən) [Click for IPA pronunciation guide]
 
n
chem Compare orthohydrogen 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

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Para-hydrogen is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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