Diquark - definition of diquark by The Free Dictionary
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(Atomic Physics) a low-energy configuration of two quarks attracted to one another by virtue of having antisymmetric colours and spins
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The significant point to this is that the quark-antiquark coupling (designated ud') is transmuted into a temporary diquark
selfstate (designated ud) following a simple exchange of the state-antistate couplings of the neutral pions (designated dd' and uu').
Some theorists, including Karliner, Lipkin, and Wilczek, propose that pentaquarks may involve two-quark subgroups known as diquarks