parahydrogen

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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World English Dictionary
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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00:10
Parahydrogen is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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