Search Result for "strontium 90":
Wordnet 3.0

NOUN (1)

1. a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones; 



WordNet (r) 3.0 (2006):

strontium 90
    n 1: a radioactive isotope of strontium (with the mass number
         90) that is present in the fallout from nuclear explosions;
         can be assimilated like calcium into bones