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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:
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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