Cesium

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [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
       n : a soft silver-white ductile metallic element (liquid at
           normal temperatures); the most electropositive and
           alkaline metal [syn: {caesium}, {Cs}, {atomic number 55}]