ˈn(y)üˌklīd noun
( -s )
Etymology: nucl eus + -ide (irregular from Greek eidos species, form) — more at idol
: a species of atom characterized by the constitution of its nucleus and hence by the number of protons, the number of neutrons, and the energy content : an atom of specified atomic number and mass number — compare isobar , isotone , isotope , radioisotope
the different isotopes of an element are composed of nuclides having the same atomic number but different mass numbers
• nu·clid·ic (ˈ)n(y)ü|klidik adjective