nucleon[no̵̅o̅′klē än′, nyo̵̅o̅′-]
Particle Physics either of two stable baryons, the proton and the neutron, that make up the nucleus of an atom
Origin of nucleonnucle(us) + (prot)on
Either of the two fermions (the proton and the neutron). Nucleons have one-half unit of spin and are basic components of all atomic nuclei.