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From The Collaborative International Dictionary of English v.0.44 [gcide]:
cesium \cesium\ n. the chemical element of atomic number 55. It is a univalent element, the most electropositive metal. Symbol Cs; atomic weight 132.905. IT has a melting point of 28.4[deg] C.
Syn: caesium, Cs. [WordNet 1.5]
From WordNet (r) 2.0 [wn]:
cesium
noun: a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal [syn: {caesium}, {Cs}, {atomic number 55}]
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