CAESIUM

Cæ "si *um, n. Etym: [NL. , from L. caesius bluish gray. ] (Chem. )

caesium

cae si um ▶noun British spelling of cesium.

caesium clock

cae |sium clock ▶noun an atomic clock that uses the vibrations of caesium atoms as a time standard.

caesium

caesium |ˈsiːzɪəm |(US cesium ) ▶noun [ mass noun ] 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. (Symbol: Cs ) ORIGIN mid 19th cent.: from Latin caesius ‘greyish-blue ’ (because it has characteristic lines in the blue part of the spectrum ).

caesium clock

cae |sium clock ▶noun an atomic clock that uses the vibrations of caesium atoms as a time standard.

caesium

cae si um /síːziəm /名詞 ｟英 ｠＝cesium .