ALL meanings of cesium
ce·si·um
C c - noun cesium a soft, silver-white, ductile, metallic chemical element, one of the alkali metals and the most electropositive of all the elements: it ignites in air, reacts vigorously with water, and is used in photoelectric cells: symbol, Cs; at. no., 55: a radioactive isotope (cesium-137) with a half-life of 30.17 years is a fission product and is used in cancer research, radiation therapy, etc. 3
- noun cesium 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. 1
- noun cesium chemical element 1
- noun cesium a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; atomic weight: 132.905; atomic number: 55; specific gravity: 1.9 at 20°C; melts at 28.5°C. 1
- noun cesium (US) Alternative spelling of caesium. 0