caesium clock (English, noun)
expansion: caesium clock (plural caesium clocks)
Senses:
glosses: A type of highly accurate atomic clock that is regulated by a resonance frequency of caesium atoms (the same frequency, 9,192,631,770 Hz, on which the precise scientific definition of the second is based).
Forms:
form: caesium clocks
tags: plural
form: cesium clock
tags: alternative