n :  a heavy radioactive isotope of cobalt having the mass number 60 produced in nuclear reactors and used as a source of gamma rays esp. in place of radium (as in the treatment of cancer and in radiography) - called also radiocobalt  .
 
 
 
Similar sounding terms:  co·balt 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.