Fragments of music: A, E, and Cs

• Alkaline metal element
• Extremely abrasive music could be metal
• The most electropositive and alkaline metal
• A soft silver-white ductile metallic element (liquid at normal temperatures)
• Reactive metal element

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
caesium \caesium\, Caesium \C[ae]"si*um\, n. [NL., from L. caesius bluish gray.] (Chem.) A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
see cesium .

Wiktionary Word definitions in Wiktionary
alt. A metallic chemical element (''symbol'' Cs) with an atomic number of 55. n. A metallic chemical element (''symbol'' Cs) with an atomic number of 55.

Wikipedia Word definitions in Wikipedia
Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature ...