isospin

noun
iso·spin | \ˈī-sə-ˌspin \

Definition of isospin 

: a quantum characteristic of a group of closely related subatomic particles (such 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, in the meaning defined above

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The first known use of isospin was in 1961

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Britannica.com: Encyclopedia article about isospin

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