isotope

iso·tope

noun \ˈī-sə-ˌtōp\

Definition of ISOTOPE

1

: any of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties

2

: nuclide

—iso·to·pic \ˌī-sə-ˈtäp-ik, -ˈtō-pik\ adjective

—iso·to·pi·cal·ly \-ˈtäp-i-k(ə-)lē, -ˈtō-pi-\ adverb

—iso·to·py \ˈī-sə-ˌtō-pē, ī-ˈsät-ə-pē\ noun, plural iso·to·pies