noun Physics.

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isospin (ˈaɪsəʊˌspɪn)
isobaric spin, Also called: isotopic spin 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

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American Heritage
Science Dictionary
isospin  [%PREMIUM_LINK%]     (ī'sə-spĭn')  Pronunciation Key 
A vector quantity of quantum systems (especially subatomic particles) that is conserved in strong interactions and is used to characterize particles that are affected equally by the strong force but have other dissimilar properties, such as different electric charges. For example, protons and neutrons, which are indistinguishable with respect to strong force interactions, have the same isospin. Also called isotopic spin. See also baryon number, strangeness.

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Example sentences
The selected aspects of spin-isospin nuclear excitations are studied.
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