1. In Current Science, a nuclide is a distinct kind of atom or nucleus, as defined by the numbers of protons and neutrons in the nucleus; an isotope.
2. In Neu Theory, a nuclide is a charge shielded neucleon cluster. There are only three neucleons that make up all naturally occurring nuclides. Two neucleons, the deuteron and the neutron make up all stable nuclides. The third neucleon the helion, is stable when free, is not stable when part of a larger nuclide, and will radioactively decay into a stable nuclear structure containing only deuterons and neutrons.
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