Webster's English Dictionary

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nuclide

nu.clide \'n(y)u:-.kli-d\ \n(y)u:-'klid-ik\ n [nucleus + -ide, irreg, fr. 
   Gk eidos form - more at IDOL] : a species of atom characterized by the 
   constitution of its nucleus and h ence by the number of protons, the number 
   of neutrons, and the energy content - nu.clid.ic aj