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ce·si·um (cae·si·um)
 cesium (caesium)
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- pronunciation:
- si
zi
 m
- features:
- Word Combinations (noun)
| part of speech: |
noun |
| definition 1: |
a highly reactive chemical element of the alkali metal group that has fifty-five protons in each nucleus and that occurs in pure form as a soft, silvery metal melting to a heavy liquid just above room temperature. (symbol: Cs)
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| definition 2: |
a salt compound of cesium and chlorine used in medicine and research as a high-density purification agent; cesium chloride.
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