strontium 90
English Thesaurus
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 (noun.substance)
| hypernym | : | atomic number 38, sr, strontium, |
| definition | : | a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite (noun.substance) |
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