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caesium clock

British

noun

a type of atomic clock that uses the frequency of radiation absorbed in changing the spin of electrons in caesium atoms See also second 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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caesium clock

Without the caesium clock, for example, satellite navigation would be impossible.

From BBC ● Oct. 3, 2014

It's because this transition frequency is so much higher than the resonant frequency of quartz that a caesium clock is so much more accurate.

From BBC ● Oct. 3, 2014

It was here in the 1930s that the physicist Louis Essen developed the first quartz ring clock, the most accurate timepiece of its day, and a precursor of the caesium clock.

From BBC ● Oct. 3, 2014

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023