noun iso·spin \ˈī-sə-ˌspin\

Definition of isospin

  1. :  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


Learn More about isospin

Seen and Heard

What made you want to look up isospin? Please tell us where you read or heard it (including the quote, if possible).