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cesium US English

The chemical element of atomic number 55, a soft, silvery, extremely reactive metal. It belongs to the alkali metal group and occurs as a trace element in some rocks and minerals

Cs in cesium US English

The chemical element of atomic number 55, a soft, silvery, extremely reactive metal. It belongs to the alkali metal group and occurs as a trace element in some rocks and minerals

caesium New Oxford Dictionary for Writers & Editors

chemical element of atomic number 55

caesium clock US English

An atomic clock that uses the vibrations of caesium atoms as a time standard