isospin
iso·spin
noun \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
First Known Use of ISOSPIN
1961
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