STRONTIUM 90

 I. (noun) 

Sense 1

Meaning:

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

Classified under:

Nouns denoting substances

Hypernyms ("strontium 90" is a kind of...):

atomic number 38; Sr; strontium (a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite)

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