Dictionary

isospin

noun iso·spin \ˈī-sə-ˌspin\

Definition of ISOSPIN

:  a quantum characteristic of a group of closely related subatomic particles (as a proton and a neutron) handled mathematically like ordinary spin with the possible orientations in a hypothetical space specifying the number of particles of differing electric charge comprising the group —called also isotopic spin
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First Known Use of ISOSPIN

1961

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