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Pronunciation: sē′zē-ŭm

Definition: A metallic element, atomic no. 55, atomic wt. 132.90543; a member of the alkali metal group. 137Cs (half-life equal to 30.1 years) is used in the treatment of certain malignancies.

[L. caesius, bluish gray]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.