cesium
Multiple Entries:cesium caesium
Concise Oxford English Dictionary © 2008 Oxford University Press:
cesium/ˈsiːziəm/
▶noun US spelling of caesium.
Concise Oxford English Dictionary © 2008 Oxford University Press:
caesium /ˈsiːzɪəm/ (US cesium)
▶noun the chemical element of atomic number 55, a soft, silvery, rare, extremely reactive metal of the alkali metal group. (Symbol: Cs)
– origin C19: from L. caesius ‘greyish-blue’ (because it has characteristic lines in the blue part of the spectrum).
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