n :  a heavy radioactive isotope of strontium having the mass number 90 that is present in the fallout from nuclear explosions and is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals - called also radiostrontium  .
 
 
 
Similar sounding terms:  ster·not·o·my  stron·tium 
 
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