isotone [ahy-suh-tohn] Word Origin noun Physics.
- one of two or more atoms having an equal number of neutrons but different atomic numbers.
- one of two or more atoms of different atomic number that contain the same number of neutrons
isotone in Medicine isotone [ī′sə-tōn′] n.
- One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.