isospin

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i·so·spin

 (ī′sə-spĭn′)
n. Abbr. I
A quantum number related to the number of charge states of a baryon or meson.

[iso(topic) + spin.]

isospin

(ˈaɪsəʊˌspɪn)
n
(General Physics) an internal quantum number used in the classification of elementary particles. Particles which have very similar properties except for those associated with their charge are regarded as forms of the same fundamental particle with different components of the isospin in a certain direction in an imaginary space. Also called: isobaric spin or isotopic spin

i′sotop′ic spin′


n.
a quantum number that is related to the number of different values of electric charge that a given kind of baryon or meson may have. Symbol: I Also called isospin.
[1935–40]